Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc76073a195aca1b…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 00:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e4637a8bc2b3185f573804e543728bc SHA-1: 7a2f4772894766b4091d8c31eebf40aa4cc271ea SHA-256: cc76073a195aca1b5b8df7fee3f5138c47b9941b2d704c8e883d90d0048d64c2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://inwebjor.ru/pbw?utm_term=english+grammar+b2+pdf, which is likely used to serve a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=english+grammar+b2+pdf
    • https://fiduvoxasugi.weebly.com/uploads/1/3/4/8/134856114/tenogegubosuv.pdf
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/698fd23444c0.pdf
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/gixiseda-vipofesoso-safogo-xutorirubafib.pdf
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/lejeremujunapurifoza.pdf
    • https://nibedubuw.weebly.com/uploads/1/3/7/5/137517062/5208594.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/lujabolupotuna.pdf
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/625247.pdf
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/3485880.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/089bc6d07.pdf
    • https://zojolutavalo.weebly.com/uploads/1/3/5/3/135345328/2122530.pdf
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/9082796.pdf
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/wafad-xojezob.pdf
    • https://puraxatelodo.weebly.com/uploads/1/3/7/5/137518437/jevodajopimaja.pdf
    • https://mafewesoxadix.weebly.com/uploads/1/3/4/6/134697647/tigefatukewadis-xezad-vefexamurinibow-zemufuwamutig.pdf
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/bab05c887.pdf
    • https://kojegowi.weebly.com/uploads/1/3/4/6/134685768/goxazuraleveri-nujet-gigadugusoxeb-nekudur.pdf
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/91b01b4078c5.pdf
    • https://daxajofu.weebly.com/uploads/1/3/0/7/130740026/lixavepeluralurorobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10c86cfa-b55c-4472-abd8-ec9b83566c03/gate_civil_engineering_books_free_download.pdf
    • https://uploads.strikinglycdn.com/files/35214585-c7f6-4a4c-b64b-0bdda9b8dba2/64910940928.pdf
    • https://uploads.strikinglycdn.com/files/0bd61603-b53d-4816-a7b5-21c082740d18/percy_jackson_and_the_lightning_thief_book_summary_chapter_1.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbb.bin
6f6b8d19b3acb3a2932a4f26a29effa5ccc6236391be947c785b345152bc9abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 5684 bytes
font_01_sfnt_off0000f2e4.bin
42580ff5c4fda574ab4fade597bd0ebc69b5b9cc05eac3e8a93b54996780a1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 11456 bytes

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