Malicious PDF — malware analysis report

Static analysis result for SHA-256 02854351f2f12d4d…

MALICIOUS

PDF

83.0 KB Created: 2021-02-24 21:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 68c6da9e1cb3ffbc8c2960813a848285 SHA-1: d6629fb8d448af55f4f1cb45cbcbc952642710e4 SHA-256: 02854351f2f12d4dedc8c7ea952a0b855deacd020f80aa40bdd1ed7a774be50d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary focus on directing users to 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using multiple disposable domains. The document body, though heavily obfuscated, contains keywords related to the primary URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=operation+deep+dive+gfl+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443588/normal_603401d767541.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/gevomumomunazisasiruruso.pdfIn PDF document text
    • http://erogan-oficial.site/gummed_kraft_paper_sheets0il60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495042/normal_6002d4ad15ced.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/36984546290.pdfIn PDF document text
    • http://futup.ru/95058310886cj8lw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_600d2914c5263.pdfIn PDF document text
    • http://bandalet.club/doctors_note_template_microsoft_wordbjxgq.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/cqcuUZ8/rolobomuvakuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/JwAighb/burugovonizuwer.pdfIn PDF document text
    • http://italia-doc.fun/inference_worksheets_for_grade_5ph6sv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jeborawaleko.atwebpages.com/65350816353.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/ncees_fe_results.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/38369678579.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/webster_english_spanish_dictionary_online.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/83020008072.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/why_wont_my_dishwasher_dry_plastic.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 5000 bytes
SHA-256: 64398fac7e505c0b084980ce7bebf96fa3c91635b57d3856a1ba97e74bccf7d8
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10080 bytes
SHA-256: d69c4e6f5986e18b209f45199d782348931db448511d41d08e1f781797e8fa5c
font_02_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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