Malicious PDF — malware analysis report

Static analysis result for SHA-256 319a00fb2f2b83c8…

MALICIOUS

PDF

72.4 KB Created: 2021-03-03 14:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd6d7309413516113eea59a656824be4 SHA-1: 901aba5a1a31a4e7be74cf5d99820795aa555359 SHA-256: 319a00fb2f2b83c892d92b80e2a9a7a6817085f50ba5c3cf74cd51aa9a32aa8d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, with the primary lure being 'Bangla band song mp3 download'. The presence of external URIs and the classification as a link farm suggest the document is designed to redirect users to potentially harmful content, likely a phishing or malware distribution site.

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://dafemum.ru/strik?utm_term=bangla+band+song+mp3+download
    • http://lianhua.life/951376909883p3dq.pdf
    • http://hytri.com/19640559549a2yht.pdf
    • http://sacredname.ru/dragon_scroll_famicom42tnh.pdf
    • https://cdn-cms.f-static.net/uploads/4450427/normal_6039e13ce0d6a.pdf
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/deruxepevobu-sumefukunaja-ribufifudurez.pdf
    • http://shoppingyxplus.xyz/65721109722hs0lv.pdf
    • http://smotrikino.fun/dimimobogilemodidhtis1.pdf
    • http://wordwild-store.com/miss_universe_philippines_2012_question_and_answercvblg.pdf
    • http://falisekivi.iblogger.org/40717277969.pdf
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5fcd18ad66e19.pdf
    • http://outputqwvk.space/xokeduzuwbgibx.pdf
    • http://sberpodarok2020.online/karcher_pressure_washer_pump_3000_psi9biyh.pdf
    • http://qrettalq.online/parasound_a23_manuallrkc4.pdf
    • http://lavka-karamel.ru/the_diary_of_anne_frank_quiz_and_ans7tb53.pdf
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/tunubiman.pdf
    • http://smartcreditcheck.info/whats_long_and_hard_jokexz76r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vorasatijede.rf.gd/40522931810.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_off0000dceb.bin
2f077bf2d9412f383a8a51601b7f92640bb8a59ebf4c506d497cf0a14d84f9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 5628 bytes
font_01_sfnt_off0000f00a.bin
c98fd509d81f43459b2f58146752942ba793cbebbcef5e0ae9f4999b19350a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 10784 bytes

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