Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96dbe3b7bece03b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-21 20:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f4df38d027145fd625bb4a62a76b7ffe SHA-1: b123ba312dd2486997cf5b3da07d86f17cd36133 SHA-256: c96dbe3b7bece03b62809e35e35edc4b9f8bbcdfed654cf9717bfd40418eafb1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a pretext of an internship application to encourage link clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/award?keyword=architecture+internship+application+letter+pdf PDF link annotation
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/setoxofefudasa_galorajasal_gifupam.pdfIn PDF document text
    • https://zifatajute.weebly.com/uploads/1/3/1/4/131438038/7783860.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/UEjhagg/youngboy_never_broke_again_all_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/Tha2fse/rulabapaserulop.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/nuxibapaxapavud-kigunaxasigupat.pdfIn PDF document text
    • http://xubasis.22web.org/algebra_booleana_libro.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/dz3ieuq/kipezepabelokefi.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jf2Pide/nofizegopani.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/Khi6Dsx/2nd_line_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/ajehfic/kuxirero.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/00b9d3a078edf.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/hibI0ha/37121241287.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/lma5jhi/fruit_slicing_game_ipad.pdfIn PDF document text
    • https://likixolokezixi.weebly.com/uploads/1/3/0/7/130738950/60f0bee5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_e914df517df94349b017fb7a593126ae.pdf?index=trueIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_ae84f9fff8674e3f996a2c0aadb3b907.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_e94a179bab4c4922a29f1c3118bc5ffb.pdf?index=trueIn PDF document text
    • http://gafibis.epizy.com/old_bhojpuri_film_video_songs_free.pdfIn PDF document text
    • http://jonemif.epizy.com/mopukobedapufefal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9426e2-1bf9-4a67-9453-9128ca786c82/39124084599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e360a7c1-1019-4980-a268-d6994c3252ab/how_to_make_a_map_in_minecraft.pdfIn PDF document text
    • http://kagimotazife.epizy.com/nazevosiwipeviwo.pdfIn PDF document text
    • http://dedenolusurefig.epizy.com/dokatudevelid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0c32b2-03e2-4ac1-bf15-557ebeaa5243/45477154760.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_63892018d1c745b8b24fafc16d7ddceb.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5232 bytes
SHA-256: 241dfda33350d1ff701dcc8beebfe653b9012c6771bd7de3d070cfd42adbb7d6
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10844 bytes
SHA-256: a97a6d0b495e36c7eadfbd6ca2a65a986051ba89cafda7bd63bac622dceb19ca