Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7606c56de42161…

MALICIOUS

PDF

70.4 KB Created: 2020-12-10 15:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e83d5b3a5fee79ff5a3e7474c782f574 SHA-1: 78425fde99425186cb3d19b1b7e1a87850ecec0e SHA-256: 1a7606c56de4216191f1b66a80094f76dd8d5c5b7a964e5cb8869e70276146cb
222 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially garbled, suggests a lure related to legal documents ('Affidavit in lieu of originals'). The presence of multiple external PDF links, some pointing to potentially benign but numerous files, indicates a link farm or redirection strategy. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gettraff.ru/123?utm_term=affidavit+in+lieu+of+originals+oci
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/xegajisa-lilinorove.pdf
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/likelixagutebe-bufonabexuro.pdf
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd18f0226a16.pdf
    • https://rekeboko.weebly.com/uploads/1/3/4/8/134899800/lefafivenolevuw-dutezidonezotun-rubak.pdf
    • https://www.in.ckgs.us/oci/index.shtml2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e65b370a-1eb9-4caf-b6ff-4c6adfcff9a8/98467864182.pdf
    • https://uploads.strikinglycdn.com/files/130a5da5-de69-4ca4-8700-e27891eb308d/80697220732.pdf
    • https://uploads.strikinglycdn.com/files/5504e1e5-445e-416d-ae1d-65dda055b8ba/the_ninth_hour_review.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4ea3145a8629dca775f1/1606373028090/galovob.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf609fcb3e0f5771471c90/1606377656837/tenafene.pdf
    • https://uploads.strikinglycdn.com/files/cbe46bb2-210e-4e63-aa7d-ae0e87887480/78881601787.pdf
    • https://uploads.strikinglycdn.com/files/bb8399c1-9fc5-49ba-8fc9-95a711a11aa3/ruletivewutumefu.pdf
    • https://uploads.strikinglycdn.com/files/6887ccd9-4b62-41d6-8171-d1de0697407e/19216688209.pdf
    • https://uploads.strikinglycdn.com/files/f5e72a2f-5781-44e6-9fda-7d313fe5618f/fuvudefuzirego.pdf
    • https://uploads.strikinglycdn.com/files/eeb23906-afda-4f36-aab7-698c25882d64/jazuzelafabagilerefa.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_off0000d4e3.bin
397163da82cfea07746a0cb062d4b07444b1b8be2f1829864ae2972a40a834e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 5236 bytes
font_01_sfnt_off0000e6ce.bin
1dfb20ea7960ee861ef995b88c5b71b999d079d98e144661a7349d660ccac5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 11108 bytes

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