Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5aacef405fb66e…

MALICIOUS

PDF

98.6 KB Created: 2021-05-07 11:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 096c9a93d928fdd4673aa953154c0460 SHA-1: 7e2123d29a4efb03db9f4780eb64e1fc246f7463 SHA-256: 2d5aacef405fb66e68be4d9b96c5af2f62bafe700954fe4b12db2ff5211c6587
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=ulysses+poem+by+alfred+lord+tennyson+analysis
    • https://cdn.sqhk.co/depifozopupe/giNDtig/house_of_horror_escape_room_13.pdf
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/1898112.pdf
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/3551197.pdf
    • https://cdn.sqhk.co/tokofape/hfWsvhe/68222444228.pdf
    • https://cdn-cms.f-static.net/uploads/4459325/normal_5fd84dc1b5568.pdf
    • https://static.s123-cdn-static.com/uploads/4388271/normal_5ff201b7f2ef5.pdf
    • https://cdn.sqhk.co/vumivatuvi/N6hiPQc/xibipuxaxe.pdf
    • http://randname.ru/87742081835juwfl.pdf
    • http://cabinetsly.xyz/beleminuzevafl2ez.pdf
    • http://talkme-news.info/potential_and_kinetic_energy_workshekqud6.pdf
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/fofisakabupe-gelumimuvubibas.pdf
    • https://cdn.sqhk.co/naziwixolagu/wdgdiaF/mimilarurimifumuxiv.pdf
    • https://cdn.sqhk.co/kitujesijak/hc4ijjZ/92191781182.pdf
    • https://cdn.sqhk.co/kitaparek/YLiimdO/kamukokotomukiwimesuw.pdf
    • http://enots.space/jobs_to_be_done_theoryq01ir.pdf
    • https://cdn.sqhk.co/raninogozo/Whb48bV/clash_royale_cards_max_star_level.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/muvemasoxaji/8232714550.pdf
    • https://s3.amazonaws.com/xukonakefules/1913582297.pdf
    • https://s3.amazonaws.com/solonebosop/75412226426.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137b0.bin
672683506664f4c8a56e253544225465404c64bab9f7291d9f3ef8244cf856cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B0 5208 bytes
font_01_sfnt_off00014946.bin
11802ee1790843e0385111e09f0ebe62b5bf0374fd9b0b8866d6e8032e229aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14946 11332 bytes
font_02_sfnt_off00016f60.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F60 4324 bytes

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