Malicious PDF — malware analysis report

Static analysis result for SHA-256 f255ae44a4bd9b86…

MALICIOUS

PDF

81.5 KB Created: 2021-02-18 05:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40606409cd63b2f2256bfaec5ead51ee SHA-1: 124b1a1a0d171594d4da246afe6475b508ec7328 SHA-256: f255ae44a4bd9b86872da0d6ab23b1d4a28eef70999250a4e0a02476280201a7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm and a ML classifier. It contains numerous external links, many pointing to disposable domains or link farms, suggesting a phishing or SEO spam campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/aws?utm_term=pablo+neruda+the+word+poem+summary PDF link annotation
    • https://cdn.sqhk.co/zejizoguzut/he4aqgh/bemasot.pdfIn PDF document text
    • https://zopadujebononi.weebly.com/uploads/1/3/1/3/131380983/lofegufoso-pawof-bakum-nebeferoronod.pdfIn PDF document text
    • https://cdn.sqhk.co/kebisozakola/dohcjj4/cake_design_ideas_for_birthday.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/aLJHida/sandwich_places_near_me_with_gluten_free_bread.pdfIn PDF document text
    • http://lutefofojonu.iblogger.org/97267552613.pdfIn PDF document text
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/tetilumobunisex.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/xigimevomuv_vezokerub_vuvomolu.pdfIn PDF document text
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/xotule-ruzorikegugited.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/zuvalofisuwapaz-jejibitepojifas.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/gcE1tya/fibos.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/segowujuro_joxexasuv.pdfIn PDF document text
    • http://ribuvegiruni.iblogger.org/karuppasamy_songs_free_tamil.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/8844387.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/BjTpRgf/pets_gym_shark_simulator_codes.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/tonav.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/jokafugefubej-kenunenom.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/iKhaUhf/merge_snake_mod_apk_1._3._96.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/cgjYibp/radio_italian_music_sydney.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://ditinalozevid.epizy.com/24931845336.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/5078084411.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/manawubizokaboburijub.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/77307335178.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/jujenenimaguxixekubapa.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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5368 bytes
SHA-256: d4b0b583c1a43f25636a221482f0735f2aaa87cc2f53d4c1c2beece55b50352f
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 10176 bytes
SHA-256: 43b326fa0b7a67638960b41fb6a0b2e6a1478b72b33de354fb4d7d75d86df58e
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176