Malicious PDF — malware analysis report

Static analysis result for SHA-256 3951c7af5684239d…

MALICIOUS

PDF

73.2 KB Created: 2021-03-26 10:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66398350f087766c1eac54519f241e6e SHA-1: 608279e57408cdf54d10855279339e78ba9e5d23 SHA-256: 3951c7af5684239d4a78de6befb2e42afc0f12547174d64f9de281a83f088695
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content. The embedded URLs are likely used to distribute further payloads or lead to phishing sites.

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://botokaw.ru/wix?keyword=knights+of+bloodsteel
    • https://cdn.sqhk.co/mofijovelu/eYNifgX/52702616213.pdf
    • http://giwudogor.scienceontheweb.net/tanad.pdf
    • http://xonigej.mypressonline.com/reasoning_ability_tricks.pdf
    • https://cdn.sqhk.co/mudinaxape/nihggjo/jirulolupunoduxugoxoperi.pdf
    • https://cdn.sqhk.co/zizenozi/i6ijwgc/8825724861.pdf
    • https://sifofazawovetix.weebly.com/uploads/1/3/0/7/130776166/8841775.pdf
    • https://cdn.sqhk.co/rizonozugaj/7idQelW/49056656788.pdf
    • http://new-volosi.ru/2129203397649caw.pdf
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/rebogoxilik_gatonimuwotojam_dajevu_tubade.pdf
    • http://zutatowatipo.mywebcommunity.org/ceragon_microwave_commissioning.pdf
    • http://zeboxagekej.sportsontheweb.net/o_mio_babbino_caro_piano_solo.pdf
    • http://cheapestshop.xyz/zevivobavasaxofumv80x.pdf
    • https://cdn.sqhk.co/moxibusas/hiHiihs/gudoxilibuxisef.pdf
    • http://mantenancie.com/951284864036bdyb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_3298a2f7e8b242aa931a235932c83da7.pdf?index=true
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_8abe78a6035e4c49acb15c2fc315ccb2.pdf?index=true
    • http://wulibazosuxib.onlinewebshop.net/el_caliban_y_la_bruja.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_d2262a79c4784676843cbbc631cf9806.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin
766d1f01f42b0f4eee5c043aaf37d955969981555eac3d5bee299171e55a9bef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 4972 bytes
font_01_sfnt_off0000f2f0.bin
e38085beb042fea792ab6d70ffc6673052edc6b2cc2b389e4b24913281aa4101
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 10832 bytes