Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9bdcdecfefc9a5…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 19:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ed009e2c74fb3c5f6246b8c6d5803625 SHA-1: 77e6cf8ae432d52ed030150d1f5640a6f2650a6d SHA-256: 7b9bdcdecfefc9a5fc764a3bd77489a11bbb8c7489a50b766afd963bd10a07b3
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, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://seumenha.ru/wix?keyword=advanced+algebra+solving+literal+equations+worksheet+answers PDF link annotation
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/7fef5137.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/ggFQgia/bevetarodigisika.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/dhhckjb/machine_gun_rifle_sounds_10_hours.pdfIn PDF document text
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/6dc94a53a0.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/pomatijif.pdfIn PDF document text
    • https://cdn.sqhk.co/derubejes/hlL5ZxZ/malubabomi.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/gigcgje/street_of_rage_1_stages.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/9799932.pdfIn PDF document text
    • https://cdn.sqhk.co/wavivatus/jh0zia2/snapple_apple_case.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/levezegal.pdfIn PDF document text
    • https://fuliwerupemivu.weebly.com/uploads/1/3/5/9/135983247/jolat_dixaw.pdfIn PDF document text
    • https://gubotejulide.weebly.com/uploads/1/3/4/3/134380330/gejafenutidop.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/hibjdJM/idle_trainer_hack_mod_vip.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/igPiage/better_beard_club_reviews.pdfIn PDF document text
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/1143783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pegumagagi.epizy.com/romanian_birth_certificate_request_form.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_7f32cb19cf2d4b43b639d9d235cddaa8.pdf?index=trueIn PDF document text
    • http://webezivoxubabo.epizy.com/pujenib.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_56e0ca5f1153477ea912f36658ba5a2a.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_823ddd08474f4d8b8bff3fd92fcbd048.pdf?index=trueIn PDF document text
    • http://butadiviwev.rf.gd/element_tv_codes_ge_remote.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_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 5672 bytes
SHA-256: d5d2cfd76ed77f3c293bc3e6d88df0e40310558f41b9e07b0f1ae6054a63a83f
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 11232 bytes
SHA-256: 35c708507daccd89bce719f58b8cabad37d643ba569d96a180b7c4f4b018d53e