Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7a76121b00edae…

MALICIOUS

PDF

67.4 KB Created: 2021-04-05 05:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9e2eeddcfe6e49b8959f08c89c25ab SHA-1: 7640a474404a2c477e141f67a9501e73020f8589 SHA-256: df7a76121b00edaeefc355fe22b2359abf0d6f1a8073ae16db55a18fa96a2e4b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/123?utm_term=4th+grade+math+state+test+2017+answers
    • http://begemotiks.space/kufutenikabinasubov8bdkf.pdf
    • http://zupowebuzozasap.iblogger.org/garfield_his_nine_lives_book.pdf
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/6565421.pdf
    • http://uscreditcheck.info/section_1_composition_of_matter_work9xz0y.pdf
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/8604216.pdf
    • http://purpless.vip/nesipamuzpnji9.pdf
    • http://otomail.business/apprendre_grammaire_francaise_gratuitemento2wq7.pdf
    • https://nusatugob.weebly.com/uploads/1/3/4/8/134865614/6998170.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d43b6b2-016b-410f-bde5-0c798bf524f2/how_much_do_charcoal_portraits_cost.pdf
    • https://uploads.strikinglycdn.com/files/29a2efe4-5e19-4c93-b1df-df35e683b4c5/91640392409.pdf
    • https://uploads.strikinglycdn.com/files/596e0aec-3a48-4c42-a842-fc1159eb7919/davolata.pdf
    • https://uploads.strikinglycdn.com/files/951906cf-fc91-4029-ad94-d7c34f64320a/retapevilixolagegetowido.pdf
    • https://uploads.strikinglycdn.com/files/9e5e6fc8-b71b-46ee-a4de-cea5faa844a2/mubewapizosokoku.pdf
    • http://kazewuwebam.rf.gd/lekipobununerezevi.pdf
    • http://kifesafijupesob.onlinewebshop.net/canon_5d_mark_iii_user_manual.pdf
    • http://fezexebu.rf.gd/bucharest_map.pdf
    • http://tekisinasapev.epizy.com/asme_sec_viii_div_1_appendix_6.pdf
    • https://uploads.strikinglycdn.com/files/91b04d0d-8d0e-462a-ad12-2097f152d6c8/96779095189.pdf
    • http://zubiluwetij.myartsonline.com/polycom_soundstation_2_power_supply_voltage.pdf
    • https://uploads.strikinglycdn.com/files/2d75d713-72d2-4ecb-9023-aeb4611a1190/does_figure_8_exercise_work.pdf
    • https://uploads.strikinglycdn.com/files/521347d7-e72b-4dfc-9904-7187c2c7b66c/71615817784.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cafd.bin
36250beaf6dabd43d085abc9a3a92e21357faae4b9b3b22a288d69e1b28bff6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 5700 bytes
font_01_sfnt_off0000de58.bin
51f0762040f35dcd14fd8684d6ac0c5af79bc2242041a245f73f3ec43df8aa07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 9976 bytes

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