Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d517afd2645b0c9…

MALICIOUS

PDF

94.0 KB Created: 2021-03-05 12:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b6f0f98a0881c76a3a991ef8b9877b7 SHA-1: b03abc8de399c32b8f0fc1a6e683e6715e236f61 SHA-256: 2d517afd2645b0c9d9b2deeb4a6a47964daa63d2980cb48f48875f58b89aed60
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary redirector URL is `https://bologen.ru/strik?utm_term=what+does+abigail+mean+in+the+urban+dictionary`, which is likely used for phishing or to serve a second-stage payload. No scripts were extracted, but the structure suggests a malicious document intended to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=what+does+abigail+mean+in+the+urban+dictionary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463005/normal_6007bd8236b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_600aee9ff2868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fe948666de38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fdaa9ac82dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_600b6988d1a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_601836a93dfa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388177/normal_5fca30d3b05da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/eclipse_java_ee_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/qaseeda_burda_shareef.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/zojirubovafalonewu.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_39297bf023614e809e4795ccf1f3fa16.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_edbf9d34f21646bdaf378949b7df3ba9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukut/comparative_adjectives_and_adverbs_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/brighthouse_financial_contact_information.pdfIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_502d4f455be2497ea47d2a13057e5c7d.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_32d84d8221424448a51ee30bbfc13104.pdf?index=trueIn PDF document text
    • http://xaxelajifamukas.rf.gd/vadefolafamolupijutef.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_2553149fbe214c4699c2cc76c20f1430.pdf?index=trueIn PDF document text
    • http://botiximura.epizy.com/roblox_shirt_templates_that_work.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/death_by_careless_driving_sentencing_guidelines_uk.pdfIn PDF document text
    • http://pumeluwona.epizy.com/sekajubadogoxopid.pdfIn PDF document text
    • http://zedotedifajo.epizy.com/ashrae_15_2016.pdfIn PDF document text
    • http://nedugone.epizy.com/14095465280.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 5608 bytes
SHA-256: bea6feb49bcc1115f71242f71fffb387dbc79011a40df345ec387d41234114e0
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 10276 bytes
SHA-256: 6c9c1a764a94c4ffae8ab6b2d46a5d8cd1d64db1cfb4427df230771a9c511f3b
font_03_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 10240 bytes
SHA-256: 31944ed9dc8261daecfdbe0ba959167622b2190a4242929a4183ca1abfdef91a
font_04_sfnt_off000152e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E4 16384 bytes
SHA-256: a8f82ce1cdc57d6cf73caeb35ba0a534b8f114798d4dfc5d6ed82df03316e49d

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