Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52641e7d3f7c6a8…

MALICIOUS

PDF

63.6 KB Created: 2020-12-17 04:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8650a75f457cb2dcb3e0415f8c4a37c SHA-1: 12fc1b6acf0b916d2791cc518e8d7728ba5c0469 SHA-256: d52641e7d3f7c6a825ecd6bd1a517d3c326aa1f4c6dbf8c7bd32bd332a534984
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or SEO spamming technique. One of the primary URLs, 'https://traffine.ru/strik?utm_term=tight+fit+evening+dresses', is suspicious. ClamAV detected the file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=tight+fit+evening+dresses
    • https://cdn-cms.f-static.net/uploads/4446270/normal_5fabc96a584e5.pdf
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/9152529.pdf
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/859ffcd99f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/figugipopar/76248569202.pdf
    • https://s3.amazonaws.com/rozebofukixus/tifisezupoligulexi.pdf
    • https://s3.amazonaws.com/leguvefu/fofatitufategofodod.pdf
    • https://uploads.strikinglycdn.com/files/9efbea70-ad1a-45e2-8261-7de052a38db1/mebuwolanus.pdf
    • https://s3.amazonaws.com/godewumazek/la_senza_uk_size_guide.pdf
    • https://s3.amazonaws.com/fovezewi/gopododatakefesu.pdf
    • https://uploads.strikinglycdn.com/files/e4f7112f-ae20-4fc3-a1e4-55a8901c9268/noma_performance_10_hp_27_inch_snowblower_manual.pdf
    • https://static1.squarespace.com/static/5fc7a732d8e4f4479968454e/t/5fcb4ddd11c29807e6d6f34c/1607159261864/t-_mobile_tuesdays_popeyes.pdf
    • https://s3.amazonaws.com/tiluwisulepam/editable_party_invitations_templates_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be32.bin
a5048635e8c9002545459a3a37cc48b8ba95eebb0f1a00252ec202cfff005dbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE32 4936 bytes
font_01_sfnt_off0000cf07.bin
e55eeef1a0dd022bac8e30ad1d44fb2f68a19c949bf435e9fe9e8a7244608662
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 10252 bytes