Malicious PDF — malware analysis report

Static analysis result for SHA-256 9275135eb8c14e34…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 13:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c32a8a4d26916a7c14aac9ce4107af06 SHA-1: 441c0802369e43f47a1eb957c525f4810aaa92dc SHA-256: 9275135eb8c14e347b2240982b573cfd4e2fbc3f42ca66ccebf3493049a2df72
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=autonomous+maintenance+in+seven+steps+pdf PDF link annotation
    • http://aires.fun/kirefuluzur6cv3w.pdfIn PDF document text
    • http://bititoxoguxal.22web.org/53890300537.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/javitamire_vugex.pdfIn PDF document text
    • https://fopepusev.weebly.com/uploads/1/3/1/3/131383694/puxabepofikipavovuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/ggfZjdX/sugomelezogen.pdfIn PDF document text
    • http://wuvudazesog.22web.org/react_bootstrap_form_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/ijcNlhh/apple_music_won_t_download_on_mac.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/kigesaten.pdfIn PDF document text
    • https://gagebopa.weebly.com/uploads/1/3/6/0/136051288/9355329.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/5262805.pdfIn PDF document text
    • https://cdn.sqhk.co/zowegifivufo/heRivRq/novig.pdfIn PDF document text
    • https://butadopol.weebly.com/uploads/1/3/1/3/131378795/zafovi_nakozinopap_riguk.pdfIn PDF document text
    • https://tukevepa.weebly.com/uploads/1/3/0/8/130814993/bemuvabokudinakaxi.pdfIn PDF document text
    • http://opensalon.xyz/shingeki_no_kyojin_season_3_voice_actorsc1qv7.pdfIn PDF document text
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/394e44ba45140.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://paganel.world/15742660205a36j9.pdfIn PDF document text
    • https://jubekajaduv.weebly.com/uploads/1/3/4/3/134345699/9344854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_b9b90f7a546e490aab924356950b02fe.pdf?index=trueIn PDF document text
    • http://bijasubibivov.rf.gd/i-_10_traffic_report_tallahassee_fl.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_d7bb6d86d8c241eaabec2f87575de8b7.pdf?index=trueIn PDF document text
    • http://lenukisevi.rf.gd/the_five_dysfunctions_of_a_team_by_patrick_lencioni.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_9403334a088c448198507a3b0270dcda.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_405e318f45734a1e910cdcb2a9491176.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_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 5224 bytes
SHA-256: d627f484b2e753173a4e8c1361c6e7539b589445f765fe16b0957055031543b6
font_01_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 11024 bytes
SHA-256: 5a01c0c3463f4eafa2b120e1d722e6e0524970e374ae22fe04313da60827952a