Malicious PDF — malware analysis report

Static analysis result for SHA-256 983341c41e95d062…

MALICIOUS

PDF

82.3 KB Created: 2021-05-20 00:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 264f91fc8b6758b3e83b95388722fc46 SHA-1: 7ab9bf589273a5391613aecc3d9716976e63385c SHA-256: 983341c41e95d0625fb1c915aae205aaf99cd1716911719ef57d39856b04a444
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF point towards a tactic of overwhelming the user with links, potentially to obscure the true malicious destination.

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://botokaw.ru/strik?utm_term=is+mcdonald%2527s+more+expensive+in+hawaii
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/1733e20bd6e.pdf
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/roxubabog.pdf
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/3d6b6167ac4.pdf
    • https://wulidinuwiniz.weebly.com/uploads/1/3/5/3/135326152/e5f47b205a.pdf
    • https://denibemexe.weebly.com/uploads/1/3/4/5/134597338/7723934.pdf
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/senodirolafudi.pdf
    • https://razamilijukiw.weebly.com/uploads/1/3/4/8/134879964/b2616a22eb342.pdf
    • https://lemirupuzomive.weebly.com/uploads/1/3/2/8/132814022/mitatone.pdf
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/gojelar.pdf
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/ba1b1b16.pdf
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/7cf19c.pdf
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ffdae563633b.pdf
    • https://pesukiziguz.weebly.com/uploads/1/3/4/1/134108741/8433578.pdf
    • https://static.s123-cdn-static.com/uploads/4417308/normal_6004473c166e2.pdf
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ff383083f86d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0392cc57-bb33-4a60-9cf6-0eb2b43d7804/57253539176.pdf
    • https://uploads.strikinglycdn.com/files/563f3036-cdf9-44d6-b225-fdd732ec5623/53747085480.pdf
    • https://uploads.strikinglycdn.com/files/ab467838-e022-4d5d-8d10-b5cb9591e737/moultrie_trace_camera_manual.pdf
    • https://uploads.strikinglycdn.com/files/0e98e511-3ed4-42e0-bd79-4482a796fd2f/fanisofibos.pdf
    • https://uploads.strikinglycdn.com/files/adf092cf-d2a1-4623-8803-6ba47589ada9/derringer_gun_meaning.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed53.bin
c66a69d89bd423f5568f2eca63637524f013d891dd6891441fc4611e159ad25a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5504 bytes
font_01_sfnt_off0000fffb.bin
0e80344ca3bd8fd3ca6e2d62ffaceaa59d857037e4eef85d5f484b59a32ff689
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 11548 bytes
font_02_sfnt_off00012723.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16036 bytes