Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40ff6a7ef9711dc…

MALICIOUS

PDF

84.6 KB Created: 2021-02-24 11:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d80abdacfb922e128ff271b43d4659f SHA-1: 4a38250f25bb060989c47bdbb28d95e4b80011b2 SHA-256: f40ff6a7ef9711dc2035e180a67ae92e1f475d79953647465b7efc6f39233ec2
244 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to external websites, with one URL explicitly identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to technical manuals. The presence of numerous links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=tc+helicon+mic+mechanic+2+manual+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4451044/normal_5ff175a69d033.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/544c230e89a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5ffd9c3a46e2b.pdfIn PDF document text
    • https://milixugaxezo.weebly.com/uploads/1/3/1/8/131856079/4778115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6035c889e598f.pdfIn PDF document text
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/sawafuxibidoma-pupobetuva-wawuruxatele-saluratezimaba.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/duwupixewimaj-bolalezux-vozer-kumed.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/vomonareg.pdfIn PDF document text
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/nufufego_pomarafife_xusale.pdfIn PDF document text
    • https://tamusibexo.weebly.com/uploads/1/3/5/9/135966636/3393312.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/gegiko-zupabos-kudosubirata-likozuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_6012c9a231589.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/tumasun/bizivonis.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/89919589822.pdfIn PDF document text
    • http://kazoverowagodi.epizy.com/konelurasubetefigik.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/ximemokazisilobokimowigo.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/nafonewelog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 5200 bytes
SHA-256: 340a1aacd8f2e2384a5ddb4a68a54845b9f06a79ee143996b9859b696a6c8095
font_01_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 2320 bytes
SHA-256: 673807302f9cd3c8e21c06017ced6e7035ac95e33fb33b6c385bf5d2d033e8f6
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 10840 bytes
SHA-256: 612c7338c7366806c20451c88ac800c92c3246b4707fc0517e3272ef70530a27

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