Malicious PDF — malware analysis report

Static analysis result for SHA-256 0591c6f2c216b0a2…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 14:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fc8d7638cd015e744d63cee8d6a0bfe SHA-1: 5f282345d18368b1081fe9a318531e48baa93d4e SHA-256: 0591c6f2c216b0a21ccbab90b7cb046218c6881742bb6c48aaf82a8123d0d518
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=what+are+the+four+original+navajo+clans
    • https://cdn.sqhk.co/godezixibufo/ibjjqPM/jibjab_happy_birthday_fart_song.pdf
    • https://cdn.sqhk.co/jogowijalaro/ekge1PP/greatest_hits_r_b_90_s.pdf
    • https://cdn.sqhk.co/pajazidif/ighbqib/download_stickman_fight_2_the_game_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4369633/normal_5fe2c5196e316.pdf
    • https://cdn.sqhk.co/xixewebirike/eXibwN1/bowudagivofumuxoroxilez.pdf
    • https://cdn-cms.f-static.net/uploads/4480899/normal_60354dec155ca.pdf
    • https://cdn-cms.f-static.net/uploads/4404740/normal_601000daade6a.pdf
    • https://static.s123-cdn-static.com/uploads/4391015/normal_5ffc5a05169bc.pdf
    • https://static.s123-cdn-static.com/uploads/4421788/normal_600346dba2592.pdf
    • https://cdn.sqhk.co/lekibefefu/dWgcXzJ/chikki_mod_apk_download_apkpure.pdf
    • https://cdn-cms.f-static.net/uploads/4366402/normal_60431165ca741.pdf
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd6440d4e026.pdf
    • https://cdn-cms.f-static.net/uploads/4369487/normal_6045f933809ab.pdf
    • https://cdn.sqhk.co/jasekazus/ftmbrYn/dezezeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pekarenov.rf.gd/android_emulator_mac_expo.pdf
    • http://muvibufoj.epizy.com/duvetora.pdf
    • http://nibejodawugizex.rf.gd/cg_police_si_admit_card_2018.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_c34cfb7b61964bfd8c2eb78aec0361f6.pdf?index=true
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_d5dcd0da1e2444b0a08d20e5fc232661.pdf?index=true
    • http://puzegekizizovin.epizy.com/answers_to_ishihara_color_blindness_test.pdf
    • http://wewuvizab.epizy.com/film_a_river_runs_through_it_cast.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_7bf330ca44ff492fbd3e92a3ee70420f.pdf?index=true
    • 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_off0000ecf4.bin
61bab07a60ab84fa752ccc9367f6b437be23096d4ce9edbc376d911d89a2cd47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5292 bytes
font_01_sfnt_off0000ff0e.bin
f82317939fd2351f157b545fd80c77aa5d0950bd5d8019478f07b4fd65cb24c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 12492 bytes

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