Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e20f7d8853a8d58…

MALICIOUS

PDF

80.9 KB Created: 2021-02-03 03:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3af35c82b97116b1f8474dfa383ed9a2 SHA-1: d6623481c1f5a812c44db117b4d56ffe197deeb1 SHA-256: 7e20f7d8853a8d587b9cd437cf8630e092816ce9493506a177978b3a5191b0e8
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL leading to a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to an "answer key", which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=wave+worksheet+1+answer+key
    • http://jobesagaponapa.22web.org/bravo_tv_episode_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4402710/normal_60038344280dd.pdf
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5fed0378bf684.pdf
    • http://itasummer.fun/72912614640c286q.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5fd7b618e90ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bufipevuril/temagurelawikonukugi.pdf
    • http://tarusuja.epizy.com/ranakilipanijodukazebu.pdf
    • http://popaxaxi.epizy.com/zovazofibuxuxazunibib.pdf
    • http://sowiveporumege.epizy.com/62313003411.pdf
    • http://favuzokusom.rf.gd/atwood_10_gal_rv_water_heater_manual.pdf
    • http://kopuperoki.epizy.com/android_google_maps_language_settings.pdf
    • http://ridexinawaje.epizy.com/fundamentals_of_accounting_principles_22nd_edition.pdf
    • http://gexaforagugozen.rf.gd/ayat_al_ruqyah.pdf
    • https://s3.amazonaws.com/legipalofi/suva_ergonomie_am_arbeitsplatz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d0.bin
202500645eb70293c0e1279f747851a5c4cd297319a5d00ae0d79459f8712f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 5124 bytes
font_01_sfnt_off0000fa5f.bin
567454cfeea3910f91e646e112064dc66c570aeeb8a049dc2e8da369745ff540		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 11228 bytes
font_02_sfnt_off000120e7.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16140 bytes

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