Malicious PDF — malware analysis report

Static analysis result for SHA-256 678e3a498440f1db…

MALICIOUS

PDF

78.9 KB Created: 2021-04-01 09:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f1bbed6a7de687cf710800e0e4f42599 SHA-1: ceedcbcb5228d3ebed790662297f3b5014a6af8a SHA-256: 678e3a498440f1dbbdfebe3e33d689d0c3624dce0f87eeb206a96d55a12c373c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. ClamAV and ML classifiers strongly flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious or SEO-manipulated 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://xezojetit.ru/wix?keyword=lightning+whelk+texas PDF link annotation
    • https://cdn.sqhk.co/gusisitixinu/hiVijVE/nawupafupefiduviki.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/tagodepewogaxub.pdfIn PDF document text
    • https://xuwovovap.weebly.com/uploads/1/3/1/6/131607152/d16b395.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/ijggwjg/nascar_race_today_live_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/LhelNj7/gunuzexupewemugiveka.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/Ejapdfx/dj_name_mixer_download_for_windows_7.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/a4bb0314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5fee2392d02cf.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/pojas_vupizuvuder_dadomesakudales.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/bedumazexu_gejowizaw_jofojemexanoz_mopuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_604fe039193f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/895cc631-22fe-4d90-a510-40aae1389256/air_force_1_high_top_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/fegorizodonu.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/libro_de_la_oit_estudio_del_trabajo.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_fcf8f1ab742f42f2b970519953cebf11.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_6afa64a213e447fcbdada092cb821207.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2f8006-7cf8-43e1-954a-3599847383bb/how_to_get_a_job_in_interior_design_without_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6b1d0d-7392-4a9d-9f8f-0bc5639fe4c6/62036075213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52101d9-04e9-4cba-881f-5b0d52df100d/surelazuwovorapited.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/rationalizing_the_denominator_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17eda5af-7f74-4de0-9a13-34ccc20db181/vunuvuxuzifotidusup.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_3d04ede1db72415a93c031ef60a74fe0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povodijirig/44594995876.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/history_of_western_philosophy_bertrand_russell_review.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 5016 bytes
SHA-256: 6caa55bfa025d439e8ec4207de1a1f1b3e2da0463cb9ab93929c0876a7f81dfa
font_01_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 10952 bytes
SHA-256: 3cfc7aa50d7fdfe0e5c6aa4857686247089c842241bc0b0465698852116eb206

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