Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2b188966479f89…

MALICIOUS

PDF

74.9 KB Created: 2021-03-03 04:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00530ef2460e4a41f44ebf2c5d3a8a73 SHA-1: 2b1a57b25da6cfd98fb745baeac1a00b918e7f73 SHA-256: 9c2b188966479f897cc1f02fdfcb0a2093ae1819bfcc0f429a156b36bc09060a
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to a site related to 'how to relieve gas with yoga', likely a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely phishing or credential harvesting.

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 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.
  • 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://golowaki.ru/123?utm_term=how+to+relieve+gas+with+yoga
    • https://static.s123-cdn-static.com/uploads/4458628/normal_5fcf44770ec76.pdf
    • http://jazajozem.iblogger.org/4095936318.pdf
    • https://cdn.sqhk.co/bidomutarili/bigggge/gawirez.pdf
    • https://zitakafe.weebly.com/uploads/1/3/4/5/134587302/rurodenivipojum.pdf
    • http://nakozek.mypressonline.com/barney_happy_birthday_song_free_download.pdf
    • https://cdn.sqhk.co/rubutemoxe/jibgcjj/buzaxesifagesepatiwudax.pdf
    • https://static.s123-cdn-static.com/uploads/4471252/normal_5fe54e527068d.pdf
    • https://cdn.sqhk.co/tolononof/kgjjgii/minecraft_earth_skin_missing.pdf
    • https://cdn-cms.f-static.net/uploads/4476281/normal_60351450d8a59.pdf
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/7786940.pdf
    • http://fadulifakibul.medianewsonline.com/86040383192.pdf
    • http://sixesijilolun.mywebcommunity.org/6206871369.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xakusineba/creche_facility_in_office_guidelines.pdf
    • http://kosezofejesuxef.atwebpages.com/75245328226.pdf
    • https://s3.amazonaws.com/divelatoxa/above_all_chords_g.pdf
    • https://s3.amazonaws.com/bejenosugede/sublease_agreement_nyc_template.pdf
    • https://s3.amazonaws.com/xuzakob/lewisville_lake_fishing_report_2018.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_off0000e9a4.bin
67c6b6c51c26eb0aa5ae61aef0f1bfa70555cab8931c4aca43eacd465557ffa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 5160 bytes
font_01_sfnt_off0000fb46.bin
fdac2913b2698c4d1d4629e4cc13932be32e1845a9ef2462799d1cb7ec601592		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10264 bytes

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