Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0ceb30e745d474…

MALICIOUS

PDF

72.7 KB Created: 2021-05-13 19:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d41b52cfb8e79fcf117787e28bc5068 SHA-1: e376f91f8b443f4ea26146412c2890dcface6d3b SHA-256: aa0ceb30e745d474bb3482abf3a7f146e681b0787f4d2cf42636dd3d9f8ce90e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=watts+premier+ro-tfm-5sv+parts
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/zabokiw-morusavozoxa-vexixu-venaba.pdf
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/4424578.pdf
    • http://sosyaltakipcipanelin.com/377725593118ojj8.pdf
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/2581214.pdf
    • http://pevojatinolotej.22web.org/40946786002.pdf
    • http://bujisefebegegum.iblogger.org/gajazoxizore.pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/b600c6812.pdf
    • http://pikowomaxuden.iblogger.org/98768325783.pdf
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/zubumesovuxi.pdf
    • http://anbieterbewertung-autoscoutch.com/kopibotuboml4c9u.pdf
    • http://meetcabinets.xyz/649267696741b46b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuzuferopo.epizy.com/zavosovirogone.pdf
    • http://nomosirusuborif.epizy.com/51605239561.pdf
    • http://savikolapuxol.rf.gd/2011_cadillac_srx_4_owners_manual.pdf
    • http://jasazovi.rf.gd/ukulele_blank_sheet_music.pdf
    • http://xubikonenagoli.epizy.com/notururefuparozakosi.pdf
    • http://basefub.epizy.com/41912752963.pdf
    • http://zakuvusebaj.epizy.com/una_canzone_d_amore_testo.pdf
    • http://dapubul.rf.gd/kebadiwenape.pdf
    • http://lejemerane.epizy.com/infectonator_2_special_zombies_guide.pdf
    • http://gidigeja.rf.gd/paniberofisetimenut.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_off0000dd87.bin
6d573a9a60cbe76f8819b82f0c2279d03b57bd41169b3cb440d57685116a4ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5244 bytes
font_01_sfnt_off0000ef62.bin
9e2f21612db28bce82c774ebd83fb7fbe69e122614c83f1e03b16347ed1f6604		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 11132 bytes

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