Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f897c1287060f76…

MALICIOUS

PDF

78.9 KB Created: 2021-05-21 05:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b1fc6a56f96060cd22c73f2a3d5c0327 SHA-1: d6b16e40fa74212f8ad80d99bfbc9feea2a24ed8 SHA-256: 3f897c1287060f7625862b14c6b26063ef6249079ecd821ec2dacca085348372
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm designed to redirect users. One prominent URL, 'https://baarspo.ru/strik?utm_term=what+is+taobao+app', appears to be a lure for users searching for information about the Taobao app, likely leading to phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=what+is+taobao+app PDF link annotation
    • https://voxapuxunud.weebly.com/uploads/1/3/1/3/131381802/e335442f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60350f70dc3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5fe66a488b03e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_603902794ca67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fe4cb126ab11.pdfIn PDF document text
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/nekalipamodufu.pdfIn PDF document text
    • https://xulomonixibeneg.weebly.com/uploads/1/3/1/4/131455416/dukop-tuvipiwomewa-lixaka.pdfIn PDF document text
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/1097680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5fd2d187b3ef1.pdfIn PDF document text
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/c40681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_604d297aad3bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_604af24e86efb.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/fefiladibefenipiju.pdfIn PDF document text
    • https://rilumegunelado.weebly.com/uploads/1/3/4/6/134615428/gurubopewunen.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/2315901.pdfIn PDF document text
    • https://vapotilixivurok.weebly.com/uploads/1/3/0/8/130814345/pugopofuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_600fe4c3beb8e.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/bisute/spotify_web_player_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/8517099038.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/blomberg_dishwasher_not_draining.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/3d_face_scanner_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/animasi_keren_untuk_power_point.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/fleischner_society_guidelines_2018_radiology.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_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 4932 bytes
SHA-256: a014883f671e6b020c414ce50d36430a72bfd37a900eb805a0f5b55215e11389
font_01_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 11132 bytes
SHA-256: 75d7a245f1125180aa8e9e8eb30d06ad5843766911166fded9573d0a79ce4915