Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d05045fb8898a6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 11:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83e7fe3a94bf7a26031bb1cb1d1d32b6 SHA-1: 9c07821973944a5a781a98d946a4c5e3720c1cc7 SHA-256: c1d05045fb8898a62a6f7c1f357e661dcb8a02a35e59758a4c45335d32bebe88
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and exhibits characteristics of a link farm, suggesting it's designed to redirect users to potentially malicious websites. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm behavior points towards an attempt to exploit user trust for financial gain or information theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://collinite.pl/userfiles/file/xivamobebatum.pdf In PDF document text
    • http://career-id.org/ckfinder/userfiles/files/tugexajuxejenuvaxiwava.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/lulut.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vitorulode.pdfIn PDF document text
    • http://analhospital.net/file/files/48034884261.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/34714595060.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/22501053776.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/fegobisasalubinumo.pdfIn PDF document text
    • http://kelvista.lt/images/files/88638072531.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/vaditomoxoxedu.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/tilijawemelojarotafidofes.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/wemolevudobubavoluxuze.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vazilokeletumoronu.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/96475185224.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/83200850326.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bigiwizosufipatug.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/zimejagitaboxa.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/13488929303.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/zemasusuvulowogogi.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/94158746552.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/78403336068.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/zusediw.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/lerazakimibetugadexunipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+galaxy+a01+romPDF link annotation
    • 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://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_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10696 bytes
SHA-256: 347490e76d9e01c8bc38446461a0c7edd48bfbca7a4c20d2121b7bb56b387532
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 18916 bytes
SHA-256: 7816cc6c46b2ae81bf6419a0f3fadb902dc1d3bc9f528d538fa3fd5aab110d40

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