Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2403a149598b7f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 05:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ed53ad48b5ab14c096c926a3eeb7facf SHA-1: c32387e5eba390e29380f4ec4a68d0608b7c7313 SHA-256: ec2403a149598b7fcdf6e6e4deff04c8696bc7af9146cb2c4ac39e83e402aa0c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://xajibur.ru/award?keyword=cutis+anserina+pdf PDF link annotation
    • https://xijozidirosem.weebly.com/uploads/1/3/4/7/134712871/75597.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/sharp_lc-55ub30u_price.pdfIn PDF document text
    • https://luwuruguvuwotom.weebly.com/uploads/1/3/0/9/130969706/nexisolixesemu_guzofexu_moniwovufi_lezul.pdfIn PDF document text
    • http://biweekamnf.com/60139198605f0tzr.pdfIn PDF document text
    • http://lidlid.xyz/kuporuxolrwvin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_6000c5a51f41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_604ba29fb05d2.pdfIn PDF document text
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/wetamiduk.pdfIn PDF document text
    • https://xunuvetokogira.weebly.com/uploads/1/3/1/3/131384336/9a4bccaf6e3f19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_603e1c5409300.pdfIn PDF document text
    • http://mon-compte-cmb.best/all_clad_slow_cooker_lid_fitbkqjo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tososite.onlinewebshop.net/past_simple_affirmative_exercises_perfect_english_grammar.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_75478be63c3a442694afd0c3f8cd6879.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_dc4fb0be18a44339821e443a2473ee02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/lavavarigepunokemigafi.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/maytag_gemini_double_oven_electric_range_manual.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_b120a1fe36634d9f83e7fa1a496ec50a.pdf?index=trueIn 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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 4908 bytes
SHA-256: 29a6fe6e0075d81d4dc08bc2e29dc18cd2e3d2de285c4de96469029f0f5ea4b5
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 12536 bytes
SHA-256: 0f1a1b5493b2939933859c20a719577ac5213dc1162c52728ac076f9a44b147b

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