Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcd8715effe5645…

MALICIOUS

PDF

70.3 KB Created: 2021-02-24 12:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e1bb6489c2618e4d8d0a98fc924e19e2 SHA-1: 40c534eb479791016a593533fb0809e834c3e2ed SHA-256: 0dcd8715effe5645654d1e7020794c4274f4bedba8b8e3aa75a0f768f39f12f8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=cubic+castles+hack+android PDF link annotation
    • http://zepidulogi.22web.org/kenmore_600_series_dryer_not_drying.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/piforexakijop_witowipuja_pomepusuvitok_bupibitawa.pdfIn PDF document text
    • http://klyshsheff.xyz/sapilavimapulilemovogesu8i7sp.pdfIn PDF document text
    • http://scandisvet.ru/xawofetapadimhnsw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5fde5b23ac058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_602ca1c300da4.pdfIn PDF document text
    • http://gegejobusi.22web.org/braun_thermoscan_ear_thermometer_user_guide.pdfIn PDF document text
    • http://5gusevshop.space/1452411220681pxr.pdfIn PDF document text
    • http://bioforcecolumbia.site/protists_vs_plants_vs_animals_venn_diagram4ed5g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fikuvine/nirozaxitedidotiganusagiw.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/c5_window_envelope_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/answers_to_crossword_quiz_underwater.pdfIn PDF document text
    • http://jemejux.epizy.com/are_the_rick_and_morty_comics_canon.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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 5136 bytes
SHA-256: 088173578211974b482eb4fc29a59507f5dfbcd03a120d2bb6e7ee7077ba435e
font_01_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 10664 bytes
SHA-256: 4d4d520cb6abff36d04c293e50e6a5b0500a71eab996bf9a9bd9a109242b0a5d

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