Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4dda815d7a1085…

MALICIOUS

PDF

74.7 KB Created: 2021-03-15 02:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45a754d22c4efeec9b68e633a1cb2c53 SHA-1: 5d40920b155a063e0e8ffdeefa524d4cc8c77f03 SHA-256: 9d4dda815d7a1085654a3c0fc9621f15baa267a16a848923647441af8a1e281d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, suggesting a link farm or redirection tactic. The document body, though partially corrupted, contains text related to wedding images, likely a lure. The presence of external URIs and a link farm suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=imagenes+de+la+boda+de+eva+luna+montaner
    • http://dusogewosat.iblogger.org/drop_shot_fishing_rig_for_speckled_trout.pdf
    • https://cdn.sqhk.co/mifijizudi/jaSWTAX/luwob.pdf
    • http://famozosivupiwij.sportsontheweb.net/68306804559.pdf
    • https://cdn-cms.f-static.net/uploads/4445754/normal_6044fa9c2322d.pdf
    • http://pesuzukotejoki.iblogger.org/autodesk_3ds_max_2015_free_student.pdf
    • https://static.s123-cdn-static.com/uploads/4369332/normal_5feaffcc117b4.pdf
    • https://cdn.sqhk.co/fazejitev/gcDX7hj/8_bit_outline_icon_theme.pdf
    • https://static.s123-cdn-static.com/uploads/4486192/normal_5fc59f2f2c51d.pdf
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5fe9ff9d4105a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_16a31ff2cc97427ab60440d47c3f67bc.pdf?index=true
    • https://bc80c028-b71a-4936-8b52-739d97125464.filesusr.com/ugd/fb4f66_f5ffa91d52a74d0bb843c131e5ed84a0.pdf?index=true
    • http://zudosikewemer.epizy.com/40424800278.pdf
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_a176cbd7a2294912be48dabad14adf3c.pdf?index=true
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_3ba3e881b6ce4b3bbad39e03bfd68313.pdf?index=true
    • http://zelagipu.rf.gd/82597794652.pdf
    • http://bixozebaxikapos.atwebpages.com/without_guilty_conscience_meaning.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_98a55314f75c405799ee051718b04acd.pdf?index=true
    • http://ruxuvejefo.epizy.com/free_template_joomla_quickstart.pdf
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_0acd440b01b74e868d1c2bac05b6048d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e164.bin
01ab9008b129ae158149189a382b3662084c09e475845b7bd84674150e879d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5280 bytes
font_01_sfnt_off0000f343.bin
9100603bcacc4e3679769bb950653f8f32f4e14cfd4b7ecac559034daf74203d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 13552 bytes

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