Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa59c930a9fe509…

MALICIOUS

PDF

71.1 KB Created: 2020-12-21 03:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e774bb59fffd7a290e0c33e2c62b2b SHA-1: 1b7c9ed8511145964df290e3b517bc3f7a1606f1 SHA-256: caa59c930a9fe509c41d7dc9f601052c0564d06c2ab14228a22022b32c354a2b
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to an online application form. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/aws?utm_term=law+cet+2019+online+application+form
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5f97896d7c6b5.pdf
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fdf48b4df42b.pdf
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/6600063.pdf
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5fdee510f3b2f.pdf
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/7231830.pdf
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fb481b60d6de.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/simunu.pdf
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5f995d8c2e723.pdf
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/694582.pdf
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f900e456e491.pdf
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fc816029ab48.pdf
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fbbbe54d7c7e.pdf
    • https://gedolumu.weebly.com/uploads/1/3/4/7/134761272/81c8b6a1dedefe4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bbcd8bcc-dabb-49d4-9ba0-a1cb384f94f8/car_x_drift_racing_hacked.pdf
    • https://s3.amazonaws.com/varolexexus/suvinedugavupexajarabemu.pdf
    • https://uploads.strikinglycdn.com/files/6f953530-1249-4d2d-99ca-ffb1b1d4af5c/zezedaragelesomatojudanom.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_off0000d8d9.bin
c1af7f97df37ed999933a734fd64512d4de3aeaa0b4a7febca2e51402352fe85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 5500 bytes
font_01_sfnt_off0000eb97.bin
06158d708fef0a36a607690c69ad6e0c28afa9e84fa3e228191b591d5c194873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10416 bytes

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