Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf24708a4564b8d…

MALICIOUS

PDF

77.6 KB Created: 2021-05-03 03:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 869bd547a3aff465006da86137ce7486 SHA-1: e07885188749798a1d320244bb00be11e0d56e8e SHA-256: 5cf24708a4564b8df9e4fb0d539ef73409cc07a199dbe3d8b6fe5b63f7567e5d
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, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+use+udp+unicorn+2019
    • https://cdn.sqhk.co/jowapezo/jZjiThh/30795183732.pdf
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/bikugade_kifolevikom_pudogupupiweg_tulut.pdf
    • https://cdn.sqhk.co/dupeguwova/jajifha/sibi_bale_stunt_driver_ford_vs_ferrari.pdf
    • https://cdn.sqhk.co/wabasenenem/uhchcgi/79249286994.pdf
    • http://gavikaluruvakuz.iblogger.org/nationalism_in_europe_class_10_questions_and_answers.pdf
    • https://cdn.sqhk.co/xajamenujo/jjkwgf9/80s_hit_songs_download.pdf
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdf
    • https://cdn.sqhk.co/pidikuso/fSF01jj/uncertainty_principle_sentence_examples.pdf
    • http://xodikiz.iblogger.org/adverse_childhood_experiences_questionnaire.pdf
    • https://cdn.sqhk.co/dilizilozok/ibdgfha/60163763209.pdf
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/ae60817638c2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gotojin.rf.gd/ateroma_en_equinos.pdf
    • https://uploads.strikinglycdn.com/files/4029060b-dc13-42e0-83dc-aa08ac77bb9c/befazemane.pdf
    • https://s3.amazonaws.com/divelatoxa/falewepex.pdf
    • https://s3.amazonaws.com/papuja/gstaad_restaurants_guide.pdf
    • https://uploads.strikinglycdn.com/files/7eea8471-df11-4faa-9301-9a9ce4e17534/penny_stocks_to_buy_today_india_november_2020.pdf
    • http://pamanivu.epizy.com/96580967311.pdf
    • http://lujotogez.rf.gd/fajevuzu.pdf
    • https://uploads.strikinglycdn.com/files/707f7233-39ef-428c-bfae-3910db0e0077/what_were_the_terms_of_the_treaty_of_paris_spanish_american_war.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_off0000ed71.bin
ec30a2526c59092c7ec7d3251c8279cf248b607966b0bd2181d9c5797f347c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 5360 bytes
font_01_sfnt_off0000ffd2.bin
c99164ce1a246e6f77fe10403055c1a88ba2b3e4f139e0ec81ae213163ca5bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 11840 bytes

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