Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eac77ff76fc2854…

MALICIOUS

PDF

131.6 KB Created: 2021-01-01 05:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 87cea19f1a8d9ebcd2210ff31db81cad SHA-1: 9bb406614a808df2285812488b5ebfc6a86745fc SHA-256: 9eac77ff76fc2854b33646429da5994aa8209c9456161888b57484b2e701c73f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'trafffi.ru'. This suggests the document's primary purpose is to redirect users to potentially malicious or deceptive websites, likely for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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.
  • 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://trafffi.ru/123?utm_term=kidkraft+savannah+dollhouse+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5fd136dbc53aa.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ijbifha/natadeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5fee841115e37.pdfIn PDF document text
    • https://bugemimeme.weebly.com/uploads/1/3/4/4/134403979/gawidisifidumirukof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5fe1557851789.pdfIn PDF document text
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/zeveloliju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fa2e07fd8be4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_5f9891dd5ff28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_5fdb8487ba33f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/patiborasefenuros.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/corporate_slideshow_after_effects_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/29193526745.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/19567462071.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/functional_skills_ict_level_2_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/latifefuzalewim.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_off0001baee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAEE 5060 bytes
SHA-256: fc2bcea7e91de393bb060a52a461ccb01d49f7192d7b4864da98aead9e586b7e
font_01_sfnt_off0001cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC2A 10892 bytes
SHA-256: 6d31d34b718884139449fed781465c5066be0beae0d7f182ce6b774c65c54277
font_02_sfnt_off0001f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F13E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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