Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b48f191d6f84c1c…

MALICIOUS

PDF

89.0 KB Created: 2021-04-25 04:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dbef0d16a7890f6ed78b91f20f5c31d2 SHA-1: dee5b0f5fe9bb872593dc12e14c90fa516a48a45 SHA-256: 3b48f191d6f84c1c645fd32d5786b3843a57724b81c2caac0e1f3065611efa57
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=python+list+remove+element+while+iterating PDF link annotation
    • https://cdn.sqhk.co/vudararemane/riaicjg/fibefifaxodumikorab.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/Xjjbl4E/hero_rescue_unique_puzzle_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupesiparu/ggaG0gc/25332243386.pdfIn PDF document text
    • http://fbcopyright-center.com/evaluating_limits_at_infinity_worksheeti1c5o.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/bgju9he/nodezisakimewazukareso.pdfIn PDF document text
    • http://safetymirrors.xyz/27088846711nomx9.pdfIn PDF document text
    • http://mx50off.pro/karome0chmc.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/iihfjij/ralakibunogede.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/gBmOAoQ/redskins_new_name_and_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/Wgegeje/87714164139.pdfIn PDF document text
    • http://tryraisins.pro/rcbs_chargemaster_1500_combo_for_saleyei2e.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/tuvodupolosuzubamexkfcw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foraxevub.rf.gd/rokokamovafixolateroku.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_a956955863644d7788227c0ab4b27e1d.pdf?index=trueIn PDF document text
    • http://minudumira.rf.gd/gafitekulidutaruwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5d773a-c9ac-4db0-a8c8-e1c3c63f3fd6/36439176681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf51d17b-dcf2-4eb6-8dac-aeac11e8aa5d/dragon_age_origins_companions_not_following.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8961ca0d-00d9-4c7d-8e49-dcd951a246eb/31667791892.pdfIn PDF document text
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_cb1004abbb4d42739bdf0830d351ca29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe43b47-1568-4f06-80aa-c05ae96447b4/7107534181.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 5356 bytes
SHA-256: 25db25ea1b5a80c1793570e64ec3f9cc8e6a5fcf0781b7764b32dea4ab3e4324
font_01_sfnt_off00012e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 11792 bytes
SHA-256: f802b11bef83f02a9796c8407d509048670a34a3293fe0fe5177e4f0d099b8a1

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