Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b0ca9d5a921f14…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 15:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c45296628e90337247a33387aa2ae580 SHA-1: 9dbfd71885772f357bccc5c0c2771aa61dcab343 SHA-256: 42b0ca9d5a921f14dcb110f9ae29ca4acaa16df8236b3c0bb93ba643e4f5b5dd
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/123?utm_term=axis+camera+station++crack PDF link annotation
    • http://bukuminuwakub.mypressonline.com/17268719000.pdfIn PDF document text
    • http://lyudi23.ru/river_flows_in_you_piano_tutorial_slowee40l.pdfIn PDF document text
    • http://turuluwugebig.22web.org/career_point_biology_notes_free_download.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/actuarial_mathematics_second_edition_1997_by_bowers.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/naxirifuriz_xubatojo.pdfIn PDF document text
    • https://likixulojuxe.weebly.com/uploads/1/3/4/3/134386003/fee5e146b95d875.pdfIn PDF document text
    • http://bonus332.site/pimaladamivolofoligmzafj.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/94385525270.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/2451127.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/xijuxosisomuna/dbx_driverack_pa2_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/inkheart_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/givimusap.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/mobelovuzevimufubowegike.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/logitech_bluetooth_audio_receiver_manual.pdfIn PDF document text
    • http://negumigimewote.onlinewebshop.net/mekup.pdfIn PDF document text
    • http://pukekutobupiv.rf.gd/46326367122.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_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 5032 bytes
SHA-256: 79b0747ec09fb07189e940522b644c54ee79d1737f41fc30318dbb16eb1d9b6c
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 11452 bytes
SHA-256: 836a4cac48166fc04a43172f56daae1d1f8db4ac94648c72c30f3deaea1ddc16
font_02_sfnt_off00011d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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