Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c6e3e54560f6b4…

MALICIOUS

PDF

75.3 KB Created: 2021-06-01 08:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 20d42539a9678c9bb9e1d1a3af44508d SHA-1: 3c865a347a0038811250c0c20bb092a0bfd075ad SHA-256: 77c6e3e54560f6b4a0eda26fa623104e2317993e28977c1418a1d96c5285c712
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external URIs points towards an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/pbw?utm_term=not+pass+probation+period PDF link annotation
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/rajemok.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/8842972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_601f5a7a10eb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_600108e99d554.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/pujigisasiber.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/37af3.pdfIn PDF document text
    • https://memumijakularaj.weebly.com/uploads/1/3/4/5/134507661/fipebew_jidakofoxa_dubajas_ladikamagilefeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_6029775a775a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_60437185b8e69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33afe4f-3606-469e-bf59-72e29789702b/pte_essay_writing_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c5de44-a17c-4592-81aa-01358b3417e6/diablo_2_best_class_for_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2042ee49-ef23-4194-8e34-d563a549ec34/dsc_neo_alarm_system_manual.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144434178/furudubejeluzukirinipof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2351e372-830e-4da6-8664-014c0d10c10a/beginner_violin_lessons.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144429126/a_list_of_collective_nouns_50_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66854f9-e8ed-432b-8487-edefd49c455e/9588640707.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/76850332612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4617b77-8d39-46d9-b75c-6664588fc228/jirozuvovasulujufuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be7e857-74af-4ce3-8469-183e53413628/4717552127.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144416892/adanga_maru_tamil_movie_download_tamilgun_hd.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144424284/spider_man_web_of_shadows_psp_free_download.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144415905/90599145744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941a182e-75d0-40c4-bfa4-c32f2c9b8c2c/bissell_proheat_essential_complete_manual.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_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 5032 bytes
SHA-256: 10149d125a3dac833aecbd1ca83a5e98d16e6434c30bc1139cfc9da4b245370d
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10668 bytes
SHA-256: 956ca7d2c285cf2f2bc49acdb4b2f2215daf302ee81c54ddc9d821d4ef3779ba