Malicious PDF — malware analysis report

Static analysis result for SHA-256 3761795b513fed66…

MALICIOUS

PDF

82.0 KB Created: 2020-12-28 16:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f5b5f6248b3b9518a6ad0b72339c13 SHA-1: d1925d9224404fcc945c1995ecbb43fe97209e0e SHA-256: 3761795b513fed6612c736b60fa14e81d6590fed00673f1dc625a91f462b0e51
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm and a ClamAV detection for a phishing trojan. The file contains numerous external URLs, suggesting it is designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of a link farm and the ML classifier's output strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=top+10+bruh+moments+2020
    • https://cdn.sqhk.co/fofasafiwi/gMbiThb/sonny_s_bbq_near_me_menu.pdf
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/bewabam.pdf
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/tovos.pdf
    • https://puzemebakojufem.weebly.com/uploads/1/3/4/2/134234574/davezum.pdf
    • https://wujuxibivotalo.weebly.com/uploads/1/3/1/4/131453464/f811295306.pdf
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/kobimodibelifetatego.pdf
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/aee3589dee5a4.pdf
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/5223912.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vobuturinivi/free_business_plan_template_for_development_company.pdf
    • https://s3.amazonaws.com/norozovijalu/arthropod_coloring_worksheet_answers.pdf
    • https://s3.amazonaws.com/nelizenejakarug/59631823587.pdf
    • https://s3.amazonaws.com/xebuvuwov/3068426716.pdf
    • https://s3.amazonaws.com/jolituzoji/rosanid.pdf
    • https://s3.amazonaws.com/xisefowu/revotosijuboxogiropumamox.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_off0000ef0d.bin
dbf2ef58adb4f48044deb8031bc32b9d017bc5adcce245149b016e2be4313d71
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 5232 bytes
font_01_sfnt_off000100b1.bin
fc37538bf93395e40a476d3312ecd6d835cf349e39f83e9e6dc7c63db8578f61
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10844 bytes
font_02_sfnt_off000125ba.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 16312 bytes