Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fc06da007a99de…

MALICIOUS

PDF

90.6 KB Created: 2021-04-19 04:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29163074988748f09d283e47a56177e5 SHA-1: af5df232d598b8b4e2c2fb1d113ad9ff3746bb8e SHA-256: b0fc06da007a99deced98a24260e5432f8143f74b70d6d8f7b51abaa659d5af4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings suggest the primary goal is to redirect users to external sites, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+much+do+cooks+get+paid+at+zaxby%2527s
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fd082d74a74d.pdf
    • http://martans.space/xfinity_stream_app_apple_tvzlhin.pdf
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fc6a0746f82f.pdf
    • http://soul-felt.com/american_athletic_conference_basketball_tournament_201902utl.pdf
    • http://on-arenas.com/8404358399345k7d.pdf
    • https://cdn.sqhk.co/wojinagimepu/jgvjdhc/52890208847.pdf
    • http://lady-bug.club/favilumukixymxd.pdf
    • http://nazhivy.net/14237464001fr6s6.pdf
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd26dd10dc69.pdf
    • http://mybiol.site/29963325422lza2.pdf
    • https://static.s123-cdn-static.com/uploads/4459477/normal_5fe1a848021c9.pdf
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5ff5d2d2bb46e.pdf
    • https://cdn.sqhk.co/devisofage/giC5Wic/40804831876.pdf
    • https://zoladikadaxupaj.weebly.com/uploads/1/3/4/6/134635808/wokuxidufavuvatamar.pdf
    • https://cdn-cms.f-static.net/uploads/4419192/normal_605f3b89c1b1c.pdf
    • https://seguvixezamab.weebly.com/uploads/1/3/5/9/135961197/18079becfa258f.pdf
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fe417169e3de.pdf
    • https://static.s123-cdn-static.com/uploads/4472774/normal_5fcee96c87542.pdf
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/dewaniwasobavemos.pdf
    • http://ses-sanobrabotka.ru/how_to_fix_ref_code_s0200_charterxo929.pdf
    • http://websporizle4.com/justice_gun_2_mod_apk_unlimited_money4uvqe.pdf
    • http://itdomen.fun/salems_lot_2004_movie_online_freemn7qn.pdf
    • https://static.s123-cdn-static.com/uploads/4469355/normal_60022539f28f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0001201a.bin
3cc81cd17e36edce828313f40cb246baac0fc9ada435829991ecffa35d0c8317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 5868 bytes
font_01_sfnt_off00013419.bin
fdc4de4d9ff4f881a13779e8c20c5a53562a4807c1c8d03003e3bdc65b819718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 11948 bytes

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