Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f4adbf4b55c506…

MALICIOUS

PDF

77.2 KB Created: 2021-02-05 02:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fc877ac23123a1ef339f7abd147a6282 SHA-1: ecda68bcb136ce3328d4cfe85ff5ef9709ac1fc4 SHA-256: b4f4adbf4b55c5063096e9b6445b2151099f11993365df1fa9916136cada8872
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and potentially redirects users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=101+dalmatian+street+watchcartoononline PDF link annotation
    • https://danawojigu.weebly.com/uploads/1/3/1/4/131407111/jabamujup_darorosimifez.pdfIn PDF document text
    • http://eeeeeyyy.space/mijiparejowepobotunebir9usfh.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/heYhgie/64238617256.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/2diiAib/business_tour_private_table_free.pdfIn PDF document text
    • http://prazdnikprosto.ru/dafuxubaztxz3q.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/dhehbHW/92097833294.pdfIn PDF document text
    • http://knitfqph.site/805306665813u1o5.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/kizexugolaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/fgcjVF9/inox_hardware_trading_llc.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/d0b96d8d42c.pdfIn PDF document text
    • http://vbruti.site/devevefenarovugosozgurc.pdfIn PDF document text
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/tofokudeg.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hXcViig/virawevumu.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/085b571b5.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/9588698.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/hvidOQl/2490225460.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/YMhdidd/vizovikovipexudemajewu.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/pasutiz/50221337059.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/rososeduxezasebo.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/free_gospel_album_sites.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_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 5372 bytes
SHA-256: 6658b533c5a21e6d0a975670751aedcd45721ae4a2e543f336ceaef67810ea8f
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 10240 bytes
SHA-256: fe754fb1a5fabf8eb2863ac636e999261c43203587ae6f7b54a29d0979fc4f05

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