Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd696ddd9523672…

MALICIOUS

PDF

77.6 KB Created: 2021-03-01 14:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e0d8882233e635cbad6a2c4800011710 SHA-1: fc0e5dc5d80bd33ab41f6dcc6ecbd350578387bc SHA-256: efd696ddd95236728dcbcff07efd84283d965418a44acdc36c41ebc95e4517c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The document body, though heavily corrupted, suggests a lure related to common search queries, further supporting a phishing or malware distribution vector.

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
  • 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://dugedepap.ru/aws?utm_term=how+long+should+i+charge+my+8.4+v+airsoft+battery PDF link annotation
    • http://vizit.store/gogumejumibatuwafvkaaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/icgc3ib/hot_fishing_spots_near_me.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/what_books_are_in_the_literary_canonmiw94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454556/normal_5fc98c5cb023f.pdfIn PDF document text
    • http://tihefers.online/hormann_supramatic_e_remote_programmingr6c6r.pdfIn PDF document text
    • http://japancar-sib.ru/axel_flovent_forest_fires6wiqm.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/fAo39jj/free_hd_movies_2019_app_download.pdfIn PDF document text
    • http://callup.today/graphic_design_book_free_downloadxhtph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_60377f1ea24e3.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/gZaw6Rl/crowded_house_sauvignon_blanc_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/jjgcJ9x/draw_climber_pc_online.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/bjbKhew/space_images_hd_4k.pdfIn PDF document text
    • http://how2clever.com/events_today_in_san_diego_north_countyitapc.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jhhcjj1/fulotuzoxadugupejaduxefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_6010a104176bc.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/gogonof/dixibopubesidowupal.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/rafawomixix.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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 6104 bytes
SHA-256: 3bfeebc84443188d3796c5cbce265910dc4625df62966fe4319f438f823f7475
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 10608 bytes
SHA-256: 164f07854d494f35305a817cfc8b3e1fbb06dfae4232260393c0f01ac81bad5b

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