Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdfa7678722be2a…

MALICIOUS

PDF

77.5 KB Created: 2021-03-02 20:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dd1961405ae11ce510c84cc3f0a9f3c5 SHA-1: a6bbcbbb6d2351949791cbf164c591d623ccc6b5 SHA-256: cfdfa7678722be2a34b2a2f6561016e5863291b3fe1875ecd99fc83f0961a0cf
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to suspicious domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/wix?keyword=90+degree+hdmi+cable+home+depot PDF link annotation
    • http://cooldomen.space/sony_playstation_vita_2019dw441.pdfIn PDF document text
    • http://loginwithfb.site/behavioural_economics_saved_my_dog8fp0e.pdfIn PDF document text
    • http://juilopkiretlo.ru/daroneluvsdzwg.pdfIn PDF document text
    • http://jsexj.fun/77259502903r1p4r.pdfIn PDF document text
    • http://ctuxuu.com/entrepreneurship_books_downloadsd0k9.pdfIn PDF document text
    • http://mydenverneighborhoods.com/el_poder_de_la_vision_dante_gebelhd92m.pdfIn PDF document text
    • http://btsworld.org/heart_failure_reduced_ejection_fraction_guidelineslfdsm.pdfIn PDF document text
    • http://austritkfa.com/birthday_greeting_cards_for_freeiq6wb.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/hjghbih/justin_bieber_friends_song_free_download.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/conair_portable_steamer_not_working.pdfIn PDF document text
    • http://mizarofu.22web.org/the_crying_game_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fe79ec63e44d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapadetesiwix.rf.gd/what_does_surah_maryam_mean.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/fejadumu.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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 5652 bytes
SHA-256: fa27aa3dc059281f1de6c7069f5fa1efe322ca047d152cc65e40f5c66788f455
font_01_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10808 bytes
SHA-256: 69f86f5084c8f084dd48303146299650dc5dbd5c8f647f492249707638ce4400

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