Malicious PDF — malware analysis report

Static analysis result for SHA-256 9659c1f8e104cb1c…

MALICIOUS

PDF

69.4 KB Created: 2021-01-16 13:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3d1d4ef89f846677c14461a6991b05a2 SHA-1: b6a26b4269b6439be13d7e790f2cc56555860148 SHA-256: 9659c1f8e104cb1c1aa4fc9c10d194640deeac6782fd2a672f3f093a0b70b86b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document also functions as a link farm hosted on disposable domains, suggesting a phishing or scam attempt. No scripts were extracted, and the document body is largely unreadable, but the presence of malicious links is sufficient evidence for this assessment.

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
  • 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 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://traffking.ru/123?utm_term=7-3+star+coins In PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/d7a3b0bacec912b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_5fed427c2282c.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/vuzigewa_zerufaxaxoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_5fdab3d277e2a.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/d5fc6f76.pdfIn PDF document text
    • https://site-1179698.mozfiles.com/files/1179698/wumuwubakejujurala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fe1f4d1552a9.pdfIn PDF document text
    • https://site-1168207.mozfiles.com/files/1168207/play_impossible_gameball.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/163333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5ffdfeda1462d.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/7dd1e090159448.pdfIn PDF document text
    • https://site-1179698.mozfiles.com/files/1179698/gobekasilododizipovufona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482399/normal_5fae13832b20c.pdfIn PDF document text
    • https://site-1178683.mozfiles.com/files/1178683/tactical_asset_allocation_models.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5ff37c17c30a9.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/sepawi/sosenavuzutanijebakiku.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/fumuwemezutegitag.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 4944 bytes
SHA-256: 82b9d82663be986dc6bd20f798c9443e499f382d24c2d01915726db33bc24051
font_01_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 9988 bytes
SHA-256: d398383ac1cf917015dd69b83cf08892883a6d3b4fb64b1871f568766f23b98e

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