Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36fb37965980773…

MALICIOUS

PDF

83.2 KB Created: 2020-12-26 09:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d9048ce0a7ed2344c15e0bbb8e42e60 SHA-1: e8531b41e5cf20f5b63fb9c1ef7e52e9fbb63aaf SHA-256: f36fb379659807730d51aa89140a676d78fa41f1f435b4734900aff8607df819
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links designed to redirect users to external websites, a technique often used for phishing or distributing malware. The primary redirector URL, 'https://traffmen.ru/aws?utm_term=behavioural+activation+for+depression+pdf', suggests a lure related to depression treatment, aiming to exploit user interest. The presence of a large number of PDF links and a critical heuristic firing for malicious redirector infrastructure indicates a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=behavioural+activation+for+depression+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f9ae4908e16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f889efb5aa29.pdfIn PDF document text
    • https://xitofubipu.weebly.com/uploads/1/3/4/3/134375163/ladekazuto_juxoxopozof_diluv.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/torafovuzed.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/wonoti/pitokomupuresakojezoze.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/napos.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/morpheme_morph_and_allomorph.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/i_ready_quiz_answers_level_f_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb9a75f-57f8-4979-867a-b7092f2a3053/stranger_by_the_lake_full_movie_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/21849466159.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 5232 bytes
SHA-256: bedd87a2d84c54471a952211a5a91c9a82fc38e27b4a1e0687cd660e1c53c723
font_01_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 11048 bytes
SHA-256: 75c98fb2948ded8bcec2b42e960c0ed9263861aafbba4a50bf2cf742bbbe8eba
font_02_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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