Malicious PDF — malware analysis report

Static analysis result for SHA-256 70de915665bb8c4d…

MALICIOUS

PDF

77.1 KB Created: 2021-04-24 13:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 96b78d3f45e05cfd51e02d8f308943aa SHA-1: 283f9c68eee111146cc241eceb66becc964e2e58 SHA-256: 70de915665bb8c4ddc5d1bdb5dfd76c0855ac8167a2ccf0a1ef1ae5d045a50d1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by masquerading as a book download.

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://midufefew.ru/strik?utm_term=prey+michael+crichton+book PDF link annotation
    • https://cdn.sqhk.co/majumoros/fheghhb/download_game_cooking_adventure_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/hghhaKq/nadukanozavozelujunof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_60481aed650a7.pdfIn PDF document text
    • http://allerop.xyz/transformer_voltage_ratio_equationp7i0m.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/FNjb4VQ/fagopow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_606b3b973d846.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/idjfbje/58504370294.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/Ujcgjaz/cyber_fighters_legends_of_shadow_battle_apk_download.pdfIn PDF document text
    • http://evakuator-uga.ru/boo_berry_cereal_barsevwyo.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/i2i7Tij/gadeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_60142acb37eaa.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/cUShghd/92941447819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_6003211d8c225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6010aa8391597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_86c89ba494ab4b33a4222dcb1ff7131c.pdf?index=trueIn PDF document text
    • http://moxilapavaz.rf.gd/small_house_plans_free.pdfIn PDF document text
    • http://folalolitawos.epizy.com/16126217342.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_4f681a068af34257a5310f9928f67635.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 5168 bytes
SHA-256: 3c63357cf062cab66037b962d73f0351343ee7db5786b96506feff02572e4c0e
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 13400 bytes
SHA-256: 76cee4d0d4798773101f53f95cd507c6b891e337780655e0cb1198b327167771

Open this report in the interactive analyzer, or submit your own file for analysis.