Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d08cab5a2b34782…

MALICIOUS

PDF

84.2 KB Created: 2021-06-06 07:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a01fd121e52dcb2a7800e3a66ba5d926 SHA-1: 253b1ef2c7718a7e8072140558cc2283539bbdb7 SHA-256: 6d08cab5a2b34782d6477d62a6437cfd4a988ce127d4f1e5993347857d4c0978
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to movie search terms, reinforcing the lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/pbw?utm_term=the+boy+in+the+striped+pajamas+full+movie+free+online+with+english+subtitles
    • https://sanejivuzagegu.weebly.com/uploads/1/3/2/7/132740711/doxaxixalalefom-nujowinej.pdf
    • https://duzebovad.weebly.com/uploads/1/3/4/3/134316699/593db7.pdf
    • https://wuvukimepegoj.weebly.com/uploads/1/3/4/6/134694914/3749209.pdf
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/vokotazujana-karika.pdf
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/3181056.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25904ffa-92fb-40fd-9e37-627688696e7f/62686615438.pdf
    • https://uploads.strikinglycdn.com/files/1caffd3c-143b-4338-9fbc-73cf22f53c40/xolazivejasilutegexere.pdf
    • https://uploads.strikinglycdn.com/files/21991b15-e240-4bc2-97f2-b8c4e6bdfd05/is_electricity_cheaper_at_night_pseg_nj.pdf
    • https://uploads.strikinglycdn.com/files/e0e3b396-8446-4aa4-bf98-dd1aa3ddaf54/how_rich_is_deepak_chopra.pdf
    • http://wefolevemud.pbworks.com/w/file/fetch/144637758/clash_of_clans_town_hall_lvl_6_best_base_design.pdf
    • https://uploads.strikinglycdn.com/files/a37d1f6b-a9e2-4501-a34f-8384c180d573/12_beast_scan_eng.pdf
    • https://uploads.strikinglycdn.com/files/745287b6-8982-4101-a5cd-1d7ccdd9f6c4/braun_replacement_foil__cutter_cassette_-_32s_series_3_-_silver.pdf
    • https://uploads.strikinglycdn.com/files/ac250883-0ff1-439d-b5eb-3dc5b25ae580/california_covid_leave_requirements.pdf
    • https://uploads.strikinglycdn.com/files/1737f0cf-29f3-456e-b4c9-e4770cb3ddec/vokenifisevifugisu.pdf
    • http://vowujepojez.pbworks.com/f/21294246675.pdf
    • https://uploads.strikinglycdn.com/files/292c0698-7f81-477f-b3c7-ed7384e884a2/jaanwar_mp3_song_download_musicbadshah.pdf
    • https://uploads.strikinglycdn.com/files/5d0573de-e660-42e4-b5f7-208c1f90ceaa/free_printable_monthly_household_budget_worksheet.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010898.bin
d5f133930be20b89329895d496a75d3f77bdd61a57f665b4f42a262fe3dc8f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 5872 bytes
font_01_sfnt_off00011c88.bin
ef0b1cbf3a9760d6c96825ee0c0cf2218b462987f0f8a910c481073a7a8c4d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 12084 bytes

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