Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1c5cbc319cad27…

MALICIOUS

PDF

88.6 KB Created: 2020-12-19 00:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cc8704e187fba5f9c27da1fc7cd9593d SHA-1: 2c2b35bbe1fe1afc8bce378d26b3a3b5c6fd8ac3 SHA-256: ed1c5cbc319cad27b257f20b65ae08d2cc5f277bd574e91972a4463fa50c9f58
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing or malicious document, specifically a "PDF_SEO_LINK_FARM" and "PDF_SEO_UTM_REDIRECTOR_LINK". The embedded URL `https://trafficel.ru/aws?utm_term=cosatto+wow+car+seat+manual` is presented as a lure for a car seat manual, but likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/aws?utm_term=cosatto+wow+car+seat+manual PDF link annotation
    • https://xogiwudib.weebly.com/uploads/1/3/4/7/134715522/vofusejiwapige_dupipuzudin_suxarovemeke_zafap.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/5631190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5fa4af934ae80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fa6a9daeb4e3.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/dobesogum/aop_full_form_in_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b9c056-2e5e-4cae-841c-ff74c17ab8dc/pokemon_character_creator_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0588c0-61b2-4e75-b715-9b5e261066fd/77710806584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f8dae4-9338-48ec-a4ee-ab64ce2fcfae/18945987809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9ef6ef-520e-4496-9ad9-f6cb14ecf6ab/multiple_accounts_apk_indian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c229b7c0-b336-4fe1-b3c1-135097eca522/california_driving_test_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867f482f-8d56-401c-abd5-1c2fac998d2d/maneras_de_amar_libro_completo.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_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 4944 bytes
SHA-256: aa74a7da7e4c34dbff7264d0154d18cf7d9bb85c39fffbf74fafa0abbe11d987
font_01_sfnt_off00013154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 10696 bytes
SHA-256: bff98258bf2e3d25147d1e286c08a516b1da9e4dcb770d12ef198c501bcdf417