Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6570fe7f5becf49…

MALICIOUS

PDF

81.4 KB Created: 2021-02-04 16:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cdc0a74b6104b2d4b745ff07795c8ae0 SHA-1: 775b126e5514c7e5f23b2d864a6e94b995298473 SHA-256: c6570fe7f5becf49a0772485bd777c55ee9694afb5a302628bd9b129ae24ebaf
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains a large number of external links, with one heuristic specifically identifying a 'mass external PDF link farm'. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially malicious or SEO-abused websites, possibly for phishing or malware distribution.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/aws?utm_term=android+save+bytebuffer+to+file PDF link annotation
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/4569904.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/90dead1d.pdfIn PDF document text
    • http://gufosizikok.22web.org/samsung_s5_emulator_android_studio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_600b6540ba9cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446944/normal_6000ae2a2849c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_600e10ff9d74e.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/sfjgsFz/battle_legion_mass_battler_apk.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/819ddf469d4bb7.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/jexijer/nunebupabovato.pdfIn PDF document text
    • http://takamuwemevofe.epizy.com/camera_apps_for_android_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/surah_an_naba_full.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/71389839796.pdfIn PDF document text
    • http://kezaforow.epizy.com/cerebro_reptiliano_limbico_y_neocortex.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/telesaxufukobedupex.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/degree_planner_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/draw_sheet_us_open_2018.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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 5192 bytes
SHA-256: b1dd69d8e13cde851a70873ab11a1b82daaf73d3f4d9ba82a73ff393a661bc1a
font_01_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 11028 bytes
SHA-256: c5562a52f09c56c8ea681c34198d81c3f60a8d6f5f0251b5b81f9dc908c1b010
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16088 bytes
SHA-256: 945115f6d333aac916ca78a4c87a19dd4828aa1f4d182cf1da7e5c9030963f60

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