Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f9e35e9b002561…

MALICIOUS

PDF

71.7 KB Created: 2020-11-17 19:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 517402c3d0cf04d53edddfdf2be28a4f SHA-1: 6a4e1bc433152d48019fec791545cf59950ca985 SHA-256: 36f9e35e9b0025614afbc66471c9932c0986ee87531a198a2687aa176a0018a6
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to a redirector service ('traffmen.ru'). The heuristic firings indicate that these links are part of an SEO link farm designed to lure users with search terms like 'soundcloud offline android apk'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via the redirector.

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
  • 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 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.
  • 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://traffmen.ru/wb?keyword=soundcloud%20offline%20android%20apk In PDF document text
    • https://wuviruwex.weebly.com/uploads/1/3/4/7/134766268/jirujez-noruzejonid.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/jujot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5fa12f4066663.pdfIn PDF document text
    • https://konevumi.weebly.com/uploads/1/3/4/3/134399330/27fa2508647d.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/tetofamuxulil/genetic_variation.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/quiz_bowl_questions_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04be332-3681-416d-ae9e-1d5f1d37b476/biwotusenaxiradotujifoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/8620584136.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/multiplying_and_dividing_fractions_with_unlike_denominators_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b31622-729b-4086-a1e3-12c34902ab14/32712769195.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/invisible_character_copy_paste_roblox.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/bcece_le_syllabus_2018_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/piaget_and_vygotsky_theory_similarities.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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 5140 bytes
SHA-256: 7d25b7f13becb5184ec433dc76d8ea35e8a9fc259853358d60a274be2a18b4f8
font_01_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 10984 bytes
SHA-256: d3570522ebf9d14d226a8e9f432dc3fcb0c2ebe88c2aa61f3d39af860b083a4e

Open this report in the interactive analyzer, or submit your own file for analysis.