Malicious PDF — malware analysis report

Static analysis result for SHA-256 423ae9b60fa2895e…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 08:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 436a2d43dbe36fab5f9c857830549d3f SHA-1: 1daf06080d7ecf13eb21ff2765207f28911a8210 SHA-256: 423ae9b60fa2895e68b25ce5eb4e29dcda77fc0c301db3bf5287be3b4c8b4f75
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the structure point towards a phishing or malware distribution campaign.

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://baarspo.ru/wix?keyword=sample+resume+with+board+member+experience PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405437/normal_604f1f1084d0a.pdfIn PDF document text
    • https://fexipipovunozem.weebly.com/uploads/1/3/2/6/132682859/62890b55b.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/7205834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fc7ac68ed67d.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/bufozopoforitix-kumituburaje-noluforavoja-tazav.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/YQM2MlU/ant_smasher_download_ipad.pdfIn PDF document text
    • https://pokezivakizame.weebly.com/uploads/1/3/4/6/134619377/14239b0d3.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/falivinisimo-pusizuligarojak.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/JihegjX/escape_plan_2013.pdfIn PDF document text
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/54a7a96a7e0f9.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/aghdiir/hask_hollywood_picture_quiz_answers_2020.pdfIn PDF document text
    • https://sesumevikenaful.weebly.com/uploads/1/3/5/3/135346106/putopomipijajag.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/greatest_showman_songs_lyricsth0b6.pdfIn PDF document text
    • http://dk-inc.xyz/fifty_shades_of_grey_full_movie_download_movies_counter7wovn.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/dogazisuze/71841225641.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/25386659053.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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 5716 bytes
SHA-256: 31a5e79ab8cac01c8e6ccd9114e49aac17a62a35ce38eefc4bad9dd1692cf99b
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10964 bytes
SHA-256: 89b276d6bad20b26e05ea57b8577388edbb326d0abc02ea4c64814ca98b9802a

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