Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f0b2051ea33e3f…

MALICIOUS

PDF

71.3 KB Created: 2021-04-11 17:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac64cbd69e780a5ef1bd837f50632e25 SHA-1: d4f0960fa6ff960e32264c298c61add7c6fd9549 SHA-256: d2f0b2051ea33e3fec91e2aad8f4884e95233cfa7cddc8e09d5c2d3bb2f45638
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'Algebra textbook homework answers pdf'. It embeds multiple external URIs, including one pointing to 'https://jacksth.ru/strik?utm_term=algebra+textbook+homework+answers+pdf', which is likely part of a phishing or redirection scheme. The PDF structure and embedded links suggest it's designed to lead users to malicious websites.

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://jacksth.ru/strik?utm_term=algebra+textbook+homework+answers+pdf
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5ffac6f78e289.pdf
    • http://kilijosizujowo.medianewsonline.com/pengertian_abortus_inkomplit.pdf
    • https://cdn.sqhk.co/gadewekunel/zpTjeQN/logo_quiz_answers_level_321.pdf
    • http://kevilokosolug.iblogger.org/fefivaxama.pdf
    • http://zimezobot.getenjoyment.net/wulojusuparawofifora.pdf
    • https://cdn.sqhk.co/kuwusetoteji/bgiVZid/archers_battle_of_agincourt.pdf
    • https://cdn-cms.f-static.net/uploads/4490746/normal_602f43bac5158.pdf
    • https://cdn-cms.f-static.net/uploads/4446784/normal_601f604b1934e.pdf
    • https://cdn.sqhk.co/dodamewope/icjey6o/bandi_chhor_divas_greetings.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/36d1b5fc-101b-49cf-9aff-7a7e159d3310/15090873171.pdf
    • https://uploads.strikinglycdn.com/files/1b835e7d-8186-42de-aef2-9c9f61624fcb/petinamojubipulol.pdf
    • https://s3.amazonaws.com/widofafane/42441958052.pdf
    • https://s3.amazonaws.com/naxizugenabi/seberkas_sinar_cover_adlani_rambe_lirik.pdf
    • http://rebipilu.epizy.com/68385889132.pdf
    • https://uploads.strikinglycdn.com/files/affcef16-9101-4879-9bb2-f070d3ed82a0/farmer_boy_ag_grain_bins.pdf
    • http://guwobugo.rf.gd/carbon_footprint_download.pdf
    • http://zukevajisuw.rf.gd/84748182112.pdf
    • http://pigutun.myartsonline.com/65956794680.pdf
    • https://s3.amazonaws.com/sowewazulejewi/jowuvizoragapozotowumil.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_off0000d64a.bin
3e5bfe6828471ddc318b82d3225d1b4918b574c074466a7f34be03ca26b4fcb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 5808 bytes
font_01_sfnt_off0000e9f5.bin
cebb81f34034e3bbf1642a9abdf0cb6db4587ba4cc28cb57e938efb6916a3151		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 10548 bytes

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