Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4c53d2cf2110a5…

MALICIOUS

PDF

72.5 KB Created: 2021-06-05 04:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3bc908531f68a40f2226c9f21210ef7 SHA-1: f9ecb48cea2cac1821457cd299b1f16f16ddc588 SHA-256: 9a4c53d2cf2110a5b41831487ae365899004b77dd4b0bdee33a05201283675a6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=mercruiser+service+manuals PDF link annotation
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/7f292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5ff5e1cfb7cca.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/funizugigoni_tomazazofubeper_foluxakumi_tezadufovokaj.pdfIn PDF document text
    • https://wemoloxemud.weebly.com/uploads/1/3/4/6/134603697/5806817.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/6935307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_604b54c3ac32e.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/xutaduparurot-wipeza.pdfIn PDF document text
    • https://vodoxuzet.weebly.com/uploads/1/3/2/6/132681632/xedazipeba-kekago-befodani.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/8757628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tubekikewabi.pbworks.com/f/best_hyperbole_and_a_half.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853bdfa9-8db8-4166-acdd-100313acf105/rogulete.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/36075745765.pdfIn PDF document text
    • http://tovemubu.pbworks.com/f/27328160871.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144508722/twilight_2009_full_movie_hindi_dubbed_download_filmyzilla_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8a29b6-0e77-481c-b992-1b4504b8e0ae/how_to_fix_your_epson_printer.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144425424/47688967217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecfeac8-039d-4e48-98b6-9dd7c40c88e3/11892442427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df387a5-41e5-4fb9-8ba7-d5dda0d79d16/hp_photosmart_7960_driver_windows_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 4704 bytes
SHA-256: 0f208339a02aba7dfa956ee335762e0e7bde6078468d1e34eba87da9a0ff0801
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 9820 bytes
SHA-256: 49d6f8dc6a5f2ddcd60bedd7daf85055996a2bf5263e1cdab72887c754ca9709
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34