Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98d903977409c78…

MALICIOUS

PDF

75.7 KB Created: 2021-04-22 18:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 920493a6b800b6d62d599163d907109b SHA-1: 271e57bf5b1ecff5fda77e12d203d46d09f6f395 SHA-256: b98d903977409c78d32109ed7c93d94fd204750eb15c3d0e3ac438773f59a441
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=magic+tree+house+merlin+missions+in+order PDF link annotation
    • https://cdn.sqhk.co/tuwagezo/bpJhijd/revasudar.pdfIn PDF document text
    • https://cdn.sqhk.co/mojubemuwek/hiii4ie/virus_scanner_for_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/3842yXi/bakery_wedding_cakes_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/xijSPid/free_ducks_in_a_row_casino_game.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/oZh2SBh/7916185333.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/jR2gijd/30888875034.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/h4Sc9Nv/6874422520.pdfIn PDF document text
    • http://pifopusilegazo.iblogger.org/tadologir.pdfIn PDF document text
    • http://waxokuvinati.iblogger.org/the_witcher_3_bestiario_completo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_83bdfa91a24c49a484699c563f52c94e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/54837202646.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/madame_bovary_2014_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/pokixilebas.pdfIn PDF document text
    • http://pejenusiloxo.rf.gd/catlogo_o_boticrio.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/vofemeverofiwenidanogi.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_5f1b1c2304804b58bd233dd6a5bb9897.pdf?index=trueIn PDF document text
    • http://jafesok.epizy.com/which_university_is_best_for_aeronautical_engineering_in_uk.pdfIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_77aecca9d255444cbc449815bc42338e.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_49988d0c94e142a0a61897e5095a098d.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 5356 bytes
SHA-256: bc845339faf10f7fdf125e6e6079364a6c3be623b4911a219f46fed56dbbca92
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 6648 bytes
SHA-256: 16f29f2545fe2471abcb613149a07e0d9bad8056711edc95dfc5db754d2d147b
font_02_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10792 bytes
SHA-256: 92eb932862e4de30f0bf36a44d090d61bba64d22a5b40bffb05ac5fdd2f9934a