Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88c4a8e25719a90…

MALICIOUS

PDF

85.5 KB Created: 2021-04-16 03:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 09284ddcae08ed50fd36283d93b466fa SHA-1: d41892e329d661644fd80e19ec7a9d60ee400575 SHA-256: c88c4a8e25719a90342c4f019e38a30b805564b960793f2e681cb0b16708855b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and using UTM parameters, indicative of a link farm or phishing campaign. ClamAV detection and ML classification strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for phishing or to download further payloads.

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://jacksth.ru/strik?utm_term=homedics+scale+sc-565+reset PDF link annotation
    • https://cdn.sqhk.co/gogojelawov/6Ljijal/74349663970.pdfIn PDF document text
    • http://ledy66.net/nemokobo6ct.pdfIn PDF document text
    • http://shtancircul.site/87937415716dug0k.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/djfkSgG/rupiv.pdfIn PDF document text
    • http://spiritstudio.ru/38692162574il5rb.pdfIn PDF document text
    • https://cdn.sqhk.co/dijexovesaf/ih8rmgg/63970468295.pdfIn PDF document text
    • https://cdn.sqhk.co/xudadidi/Vpjd3ih/motogp_2020_results_wikipedia.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/female_yellow_finch_soundec915.pdfIn PDF document text
    • http://tersq.space/93791505428af64f.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/FHhjha1/mezepilukij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_eb3b75a9f4ec44578a40f3d07b76a793.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitatotol/22537910779.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/downsizing_movie_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/server_bitcoin_miner.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/free_manager_chrome_add_on.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_35babb3121fb4e6c901e53d5e2805c74.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_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 5356 bytes
SHA-256: 079a8e54af494f672eb9ec9e165e8d7b3a41dd2e1a95ad82148d2e86fc908d21
font_01_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 11340 bytes
SHA-256: 221e0f9c6f4370943a39ba3bbd0e5b562f48a85c94c1b702b833b822d76cc6b5

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