Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d7a64db1fb923c…

MALICIOUS

PDF

82.1 KB Created: 2021-02-20 15:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc002320754c5c9d08aca0d05640ea2d SHA-1: bce1ae729f73034ef91ef7c184328e87561277b4 SHA-256: e1d7a64db1fb923ca8eb95787d66cd73478626bb6ce0b30ee1d62e9bd00a5858
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely serving as a lure to download an APK.

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://maypoin.ru/wix?keyword=download+megabox+apk+file PDF link annotation
    • https://cdn.sqhk.co/vadezewe/hejaSvG/42447171786.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/ojfMU9v/82418333046.pdfIn PDF document text
    • http://prognoz-football.club/cucumber_plantation_guide_in_the_philippinespz64r.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/fTZlBqF/ford_racing_engine_blocks.pdfIn PDF document text
    • http://idealica-tufficiale.website/city_drifters_2_game_online37wk9.pdfIn PDF document text
    • http://lofitner.buzz/668638113911vhpa.pdfIn PDF document text
    • http://retelikilerodad.iblogger.org/fonozonibu.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/jgjjmOk/personal_swot_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fd6783998b1c.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/RNWCiat/koxanufuvusosupizoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/fhcEjcZ/60461599374.pdfIn PDF document text
    • http://ipoteka.net/access_database_templates_for_clinics1ngr1.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/NeLYWje/origami_furniture_how_to_make_paper_craft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ferenekukosazu.epizy.com/naliketaretidanumilozod.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/malaguena_clarinet_sheet_music.pdfIn PDF document text
    • http://xetisovabad.rf.gd/bitbucket_commit_diff.pdfIn PDF document text
    • http://vezifapix.epizy.com/69961769172.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 5448 bytes
SHA-256: 30c182faba17afcbdfc93fed82d695f5f6d22f5cc35b6efe35a400008e2da66a
font_01_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 10348 bytes
SHA-256: a3a6d089f2253e084e2aa54a22174730515876b8d4440f2d265dba648f324369
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16164 bytes
SHA-256: 0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2

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