Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f30877c15ad5d60…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 10:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ee97457215290c4eeb9daa4c0c260c9 SHA-1: f2e2575bdd2ed4dbb53494c84fa486c738a6c9a3 SHA-256: 8f30877c15ad5d602c8b7bfa6842721d877df51155f05134ed94015819e3a3de
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to various domains, some of which are flagged as disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=scoring+the+yale-brown+obsessive+compulsive+scale PDF link annotation
    • http://usacarins.com/zixemagokurawiwukuvuxiy6dc7.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/school_the_story_of_american_public_education.pdfIn PDF document text
    • http://tehnopolis.org/pisurosoxerelakijekews4g.pdfIn PDF document text
    • https://weritesi.weebly.com/uploads/1/3/5/3/135314652/1782880.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/can_american_wii_play_japanese_games.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/4888672.pdfIn PDF document text
    • http://qlemelest.online/flat_stanley_books3k7cd.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/d6e4e66fbaba877.pdfIn PDF document text
    • https://cdn.sqhk.co/dowotovewi/fKhbee6/98233025853.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hfubSNw/minigames_minecraft_realms.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/egfijew/9614799252.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/66273286320.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/cant_help_falling_in_love_chords_uke.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/metal_gear_solid_5_ground_zeroes_unlock_missions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_0c6d7e35797141f5bc05c510cbec4649.pdf?index=trueIn PDF document text
    • http://wudazebej.atwebpages.com/20306387803.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/38729504457.pdfIn PDF document text
    • http://posikin.myartsonline.com/what_are_the_different_types_of_writing_skills.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_61571327dfd64e859264307dc9e1d0ff.pdf?index=trueIn PDF document text
    • http://kivozusemu.atwebpages.com/janik.pdfIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_4fe5748ec2bb452d989882fe788bb8c7.pdf?index=trueIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_9bce0683d3984c32a16c3233156feec5.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_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 5876 bytes
SHA-256: 27706316f2f0a790501ceff7e2d580b9461e02b314a3fee81ab03e8b2496882c
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 11240 bytes
SHA-256: 3459b8f4b270acfc311097125e59066db20120ad5b572c74b230ae7affe0dc15