Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d4844b511c7163…

MALICIOUS

PDF

85.7 KB Created: 2021-03-30 01:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 47f2da0362018482e335af545bf772d9 SHA-1: 5b4884ef23f6678e4814f7c710ff2cc663eb03f5 SHA-256: 12d4844b511c71631577a7b278a12372d589321fcd1dfeddb274de021acf73b0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with several pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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.
  • 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://xezojetit.ru/123?utm_term=metformin+and+alcohol+consumption PDF link annotation
    • http://jerimujolegem.medianewsonline.com/abiy_ahmed_book.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/how_to_say_hobbies.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/0585f089e92d6.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/lebuzemevutukulutol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_c70ae33023114fc5940d0dcd7bd7921c.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_306cfea814aa4d9983c437bc64865aea.pdf?index=trueIn PDF document text
    • https://31f314b5-0768-4c24-bd49-4596ea953b46.filesusr.com/ugd/85a4b1_57dcdd62f296426088cf176c5e0d76d2.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/18752625342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70955102-e8e6-4b82-9c0e-3439cbe414b8/rolupupok.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_85636fa5b24f4f6c9b882ac1d0547497.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e875d5f0-c5d4-44b4-b22c-2ea14874e6c9/mofidejiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051083e2-6947-470d-a881-a116f8570042/taylor_swift_false_god_snl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858f07f6-0060-431b-ade0-7e5b682c90c7/what_is_the_formula_to_find_the_surface_area_for_a_triangular_prism.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/13574007731.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_2d83d8bd75bc4d5cb0ca8a086776a7c5.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_7175708da4fe48bfbcb2df2d5d04283b.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_bd8cf7bbc4c14c9b9e19e1fcedac16aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/cisco_catalyst_3850_wireless_configuration_guide.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_20099f3c7ad848ba8854dc19ff6bb081.pdf?index=trueIn 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_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 5400 bytes
SHA-256: 8451400f708a9a268eeb445d6443996849b1e28b007979d00752f5c25b097abf
font_01_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 12084 bytes
SHA-256: c901755b36f54ae222679acf870a0723f57c0b62e40d9aec7d1092019a70033a