Malicious PDF — malware analysis report

Static analysis result for SHA-256 6308c11854c067bf…

MALICIOUS

PDF

73.4 KB Created: 2021-01-11 06:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a85fb15174ce00bf254ef628e59a74ac SHA-1: de8c7dde7db9ec263cb52ab92152eda1de20bdb3 SHA-256: 6308c11854c067bf91d5eec534b353d5e2adc09b7a13c49f030b401770986e1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external links, including one to 'traffine.ru' with a 'walk in freezer for sale' query parameter, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=walk+in+freezer+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5fb33c74bab87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455884/normal_5fe56f9c2679f.pdfIn PDF document text
    • https://site-1166732.mozfiles.com/files/1166732/setisawokataf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_5fe8e41401f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fd6e6e2b9c64.pdfIn PDF document text
    • https://site-1178662.mozfiles.com/files/1178662/95986532120.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/Igcihtx/government_job_application_form_download.pdfIn PDF document text
    • https://site-1168401.mozfiles.com/files/1168401/gold_rush_mining_camps_names.pdfIn PDF document text
    • https://jobavoxiduru.weebly.com/uploads/1/3/4/7/134722818/gasuxekil.pdfIn PDF document text
    • https://cdn.sqhk.co/nivuduful/rN4hehf/ferazusaviwapubujoja.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/voful.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/limewub/glen_rose_reporter_jail_log.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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 4888 bytes
SHA-256: 54f788f34704219c3afbf2b584353226e28dae1696208bc39d344aafc338a255
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 10876 bytes
SHA-256: 52b7a46cd91ca79e7685ff1f0a1413d6e70f29ae975328ddb6058a95e8209310

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