Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ac882db162f012…

MALICIOUS

PDF

84.2 KB Created: 2020-11-20 09:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 936146a2e8b1c03d3488e0cee3f8d334 SHA-1: 209bbe81fcf4b670106d1f59f4abd9d629bfbe7e SHA-256: b8ac882db162f0122bdd5db14efa8ed7e43d29c8b11d5865fd983ed20566d5e6
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=importance+of+balance+sheet+in+healthcare In PDF document text
    • https://fivepixulata.weebly.com/uploads/1/3/4/7/134747110/0825f1b00568e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f90d6f82c39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f925980be9e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5fb73824d4092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5f939c8d3b1a1.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/2091342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5f9a98c5544a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f8fa7ef3c4af.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/rolefosiju/16030407257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c64dd2c-773c-4cea-990b-3bc2173d4329/97762090196.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/best_book_for_c_programming_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/camera_gadget_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7efdb2-55c4-4d68-9632-b0deabe90dff/bizirugilajugabax.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/rivudan.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/96528113851.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/kufotakogopumadowukamoba.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/joragixew.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_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 5332 bytes
SHA-256: 77fda6c44bd5a8341bc7999a555e5b5a45e09e78fa4afa6aac5bb4bf47f77f8f
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10676 bytes
SHA-256: c0cb5bde33bef0fd63d4f04c6e675ab27518a9fb35cf4cd369e4ee6e88a6276c

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