Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d67b8e14830c6f…

MALICIOUS

PDF

79.8 KB Created: 2021-06-02 13:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0aa982bad3bb4e406fdf207df46b0c2 SHA-1: 497156653ce6d41c91e69a07c9f9f15d8f7a39fa SHA-256: 50d67b8e14830c6f4affcd1be5f9f9e8d3239fb6e78632b933c502845d7e717e
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 of which are to other PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://pistant.ru/pbw?utm_term=cisco+c9500-16x-2q-a+datasheet
    • https://cdn-cms.f-static.net/uploads/4497346/normal_603fae73d6692.pdf
    • https://cdn-cms.f-static.net/uploads/4411218/normal_5fdb95cb73c3e.pdf
    • https://wanukepaxe.weebly.com/uploads/1/3/4/4/134454717/720848.pdf
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/8326155.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_605f8c22a9aec.pdf
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/gejuber.pdf
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/7469274.pdf
    • https://static.s123-cdn-static-d.com/uploads/4392207/normal_60b633b05cfa3.pdf
    • https://zadoloxo.weebly.com/uploads/1/3/4/6/134602956/ef3238a584a5d.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_6067624b8ce40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/82e7ad9c-5203-4d03-8be3-a799c4c85d34/vogofufozapukigalab.pdf
    • https://uploads.strikinglycdn.com/files/e2ccae1b-27e9-4f98-ba85-7fccd0759cef/mexulogetetu.pdf
    • https://uploads.strikinglycdn.com/files/9b61769e-a711-4e23-aa55-5dc516710156/frigidaire_stackit4x_washer_and_dryer_stacking_kit.pdf
    • https://uploads.strikinglycdn.com/files/01459ce7-ece4-4fd1-89cf-c499ed9b6edf/dikelenevejewini.pdf
    • https://uploads.strikinglycdn.com/files/2a5208e9-633e-44c5-ab1d-acb5d5438a45/67905910324.pdf
    • https://uploads.strikinglycdn.com/files/6cd5255a-c5e5-4c10-8c09-1f94c32e884d/algebra_lineal_matriz_cambio_de_base.pdf
    • https://uploads.strikinglycdn.com/files/e870ed64-36cd-4ec8-8063-3c623a4c5a53/swiffer_wetjet_hardwood_refill.pdf
    • https://uploads.strikinglycdn.com/files/b32955cf-7bf3-48f3-8c8d-a8c4a708ada0/midiwawobepi.pdf
    • https://uploads.strikinglycdn.com/files/12173e07-0e28-42cd-a5ea-a1918bdefb1c/fapetaxasa.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_off0000f3e6.bin
c49a0fca351e988bfbb148753e87f2970cae06b9c3798d742fbc2203671e15eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 5788 bytes
font_01_sfnt_off000107a9.bin
2a97d565a3475b3831b84f958965d8b69a5effeb4d193eb887331b126dc3dc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 12064 bytes

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