Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb21e1da6286881…

MALICIOUS

PDF

77.1 KB Created: 2021-02-15 07:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e6a154f4e2527cba047ff85c9397f8e SHA-1: 4afa5db8320a3a6ec7651085369f667e4c770c99 SHA-256: cfb21e1da6286881261e16c62c3f00be7a83623bf12dec1096ac5d4d8e260d07
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack pattern, likely aiming to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=geometry+section+8.7+dilations+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/bikegola/dRhdjfu/gold_wedge_heels_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/cGuOgjC/download_rush_rally_2_mod_apk_data.pdfIn PDF document text
    • http://hookup681.site/62638640963voybw.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/fhi7Di3/19785533580.pdfIn PDF document text
    • http://reweder.site/tai_chi_fighting_techniquesk2k5y.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/hjPghic/sumoxedikijudiji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415946/normal_5ff7c989761a7.pdfIn PDF document text
    • http://apeech.ru/word_trip_uae_level_6_answerseixfu.pdfIn PDF document text
    • http://persequenteamsohbet.com/beef_packers_price_gouging0un3l.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/i7zEidY/sotitofivekevuzuxal.pdfIn PDF document text
    • http://eeeeeyyy.space/vifiwiniveliluna7mk6k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5ffe97e7932ce.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/HsEy7gc/dell_alienware_area_51m_r3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagiwugakit.rf.gd/alien_vs_predator_arcade_android.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/quantitative_aptitude_practice_set.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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 5776 bytes
SHA-256: 4212d85670eaa64886afc239159236e5a7f38d74f12e1fb535364e7e73e00c0f
font_01_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 11468 bytes
SHA-256: b5801a4d00c136ac0796dcdc79456b5d13d627fb2cd06fb6d9d5117110a9c278

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