Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d086bd823e1278…

MALICIOUS

PDF

70.6 KB Created: 2021-01-21 01:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6e35328bc1c58884fca2abb851f069f9 SHA-1: b3a446c87903fe4c371aa2d87c2a133a314a60cf SHA-256: a3d086bd823e1278cc971b96eae47ff0e71dcc094cc335fcc5487885b580fb3e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, embedding numerous URLs pointing to disposable hosting. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/123?utm_term=new+carrollton+amtrak+parking+rates PDF link annotation
    • https://gukofatupov.weebly.com/uploads/1/3/1/0/131070505/tafogifap.pdfIn PDF document text
    • https://site-1167933.mozfiles.com/files/1167933/wolomez.pdfIn PDF document text
    • https://site-1247443.mozfiles.com/files/1247443/vagurosopokavox.pdfIn PDF document text
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/jixalonegodako.pdfIn PDF document text
    • https://site-1172346.mozfiles.com/files/1172346/kung_fu_fighting_audio_clip.pdfIn PDF document text
    • https://site-1171784.mozfiles.com/files/1171784/63154190818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fefcd1b8b7c4.pdfIn PDF document text
    • https://site-1179918.mozfiles.com/files/1179918/xofufupimewepap.pdfIn PDF document text
    • https://site-1190639.mozfiles.com/files/1190639/sisivijironujudixaluxuxu.pdfIn PDF document text
    • https://site-1168092.mozfiles.com/files/1168092/occidental_heroes_map.pdfIn PDF document text
    • https://site-1172655.mozfiles.com/files/1172655/stickers_clash_royale_whatsapp_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5fdb1de69fcd6.pdfIn PDF document text
    • https://site-1176519.mozfiles.com/files/1176519/fufivofarukapasunaweb.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/pirosisob/gokiluwijexowugi.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/68511685262.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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 5380 bytes
SHA-256: 1f82bd72c3f5e438b6538b7f5d9d5f2f1264ee9466fd9e6e5e0906de06fb588b
font_01_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10648 bytes
SHA-256: 437e1942ee4f1f78c84cbddb069bfbe839ed1c905a7957f7ef1ad9f49c930a1e

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