Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e86c9047b44f6a…

MALICIOUS

PDF

77.2 KB Created: 2021-01-15 14:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 71083361ceea81dac87c24a44e6cbc16 SHA-1: d583fab426094c59b419e630c49fe3cedf69a00f SHA-256: 75e86c9047b44f6aec88bc3b2368d0abbf9cadd697373d1a72000aa2ee43fb0d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. One prominent URL, 'https://trafficel.ru/123?utm_term=4+pics+mystery+answers+level+11', is identified as a redirector likely leading to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafficel.ru/123?utm_term=4+pics+mystery+answers+level+11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454665/normal_5fb66874991bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_5fb7cdd28f4d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_5fda86818da3f.pdfIn PDF document text
    • https://tutamakut.weebly.com/uploads/1/3/0/7/130776204/9907702.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/3037004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fe66a585e74b.pdfIn PDF document text
    • https://muxuxinipizo.weebly.com/uploads/1/3/1/6/131637853/afd124fefb438.pdfIn PDF document text
    • https://rewegabelera.weebly.com/uploads/1/3/5/3/135390500/najokufow.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/0840f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5fbe322179880.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/wewiro/98080769255.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/kijinomofoletije.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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 5376 bytes
SHA-256: dd91bf9aff9300e25304af3f537697834b3afb582a717b71dca85b9722fa52c4
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10588 bytes
SHA-256: 5b8f1d56c3df12ee9fb396f9b32aac886c7cabb98086ceb6a26f9296b1e4008b

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