Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63b3b0a940c6ee1…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 00:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 396f6a692583668cd98190256dbf1a40 SHA-1: c25c9c659dbe3996aa8a0548b670ff4b969e6306 SHA-256: e63b3b0a940c6ee190f5b9f72b55c35d5ab08e41cdfa627c2989ecc0803947eb
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the heuristic firings indicate the primary purpose is to redirect users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://ponafet.ru/123?utm_term=web+browser+games+no PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388405/normal_5ff2d6c94a9c6.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/gikida-zaxubojap-rufon-badoboset.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/13aa74cd9206.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/u490jck/96824832029.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/uo5xUge/13186147167.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/fdcc7.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/junezelabali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_6035bf2b6f504.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/dcQjehb/motorcycle_carburetor_tuning_backfire.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/3dff7.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/gdjiaia/83574884354.pdfIn PDF document text
    • https://gurisowumar.weebly.com/uploads/1/3/4/6/134686590/255b60.pdfIn PDF document text
    • https://joziwofu.weebly.com/uploads/1/3/4/0/134012586/zijow-kumunizepet.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/libuwebanojugi.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/jdeNnQo/saludi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411917/normal_6001163d1b176.pdfIn PDF document text
    • https://pirowefe.weebly.com/uploads/1/3/4/4/134444143/xupezajemeten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_604ac682e0fbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82dbb8a-91c3-43f5-8585-c7faec801ea2/xazotin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9565d7ff-d34b-4435-b2b4-a9d14b498b34/can_fl_studio_run_on_a_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232bfbb9-5086-4745-ba86-6c10b848ca96/73153824534.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_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 5216 bytes
SHA-256: 4d9772411863eadd8daadf3ee1b9163e4cd8a05b67bee32ad17fb83be17e2e1e
font_01_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 10404 bytes
SHA-256: 9dfd6bf36edb0c8401ccd3c64c1724449236e95fca5f8ce6cb8cc673dd11cf2f

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