Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b132a09b815a429…

MALICIOUS

PDF

96.0 KB Created: 2021-04-26 03:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01a0d116a049ad0b5c0bb1120345044d SHA-1: 91ce0fedf133894c121d888867bb170251c245f6 SHA-256: 4b132a09b815a429423471b50b4e38bc95870f9dc2a6e03e5303c91b82567ef4
186 Risk Score

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 0.9989

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://leonvi.ru/strik?utm_term=how+much+for+fl+studio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fd0671471e56.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/votitoxufaje-bagewenupajow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_60161e6a3f5dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_600b63283da5f.pdfIn PDF document text
    • https://lolefisad.weebly.com/uploads/1/3/5/3/135344485/gajikonunedi-betimeginudepor-gujupow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_603f5478d3430.pdfIn PDF document text
    • https://mimedotaxejibi.weebly.com/uploads/1/3/0/8/130873786/6857568.pdfIn PDF document text
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/sawixupulamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466673/normal_5fc60fcfd5522.pdfIn PDF document text
    • https://nifilova.weebly.com/uploads/1/3/0/7/130740060/e55731f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_11a715ebcc3443bf9ae9165342500f59.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_45998cdeb3924b0d9f9c1c6e292bd5c0.pdf?index=trueIn PDF document text
    • http://jujewejono.epizy.com/kijetuxuxilivutaven.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/grunthal_livestock_market_report.pdfIn PDF document text
    • http://jorowiwiboxizuk.rf.gd/model_boat_building_plans.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_47f56ac6e6a24b5baef55c86be80d903.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_d1f869b1790a4e26bac927a01b635774.pdf?index=trueIn PDF document text
    • http://sexikiti.epizy.com/attestation_sur_l_honneur_concubinage.pdfIn PDF document text
    • http://dutupexirisebod.epizy.com/english_speaking_grammar_download.pdfIn PDF document text
    • http://femavumifixomud.rf.gd/59859761698.pdfIn PDF document text
    • http://xojesenokok.epizy.com/63718867225.pdfIn PDF document text
    • http://gesulomesazisaj.epizy.com/38135793888.pdfIn PDF document text
    • http://rilasiwawizumo.rf.gd/gasagesuluvulevozexokon.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/toponazikirarelidadiwupi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 4764 bytes
SHA-256: b1e91fb3ef3edf2d2b88a4ce84394b13627d9f6006ecbf76a82c24628c4082ec
font_01_sfnt_off00013dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDE 11544 bytes
SHA-256: 195be80b075f261cedc559ff480014b906d8a714b9e6c2de78f5e1129737afd6
font_02_sfnt_off00016563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16563 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3