Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf47047a933eef55…

MALICIOUS

PDF

74.1 KB Created: 2021-04-07 01:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6bc1a826a840b8d3c6051bc7b531391 SHA-1: cf8b45921f43884899a59aa5f5c0352d7de1473e SHA-256: cf47047a933eef55f421c72db9b70bd2ea2f1229522c1e956aa2e36f7d724f2f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to APA paraphrasing, suggesting a lure. Multiple external URIs were extracted, with a primary suspicious URL being https://ponafet.ru/strik, indicating the document's likely purpose is to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=how+to+write+a+paraphrase+in+apa
    • http://pufegusikozig.22web.org/20867129393.pdf
    • https://cdn.sqhk.co/duwafutozi/tjdHhas/arrival_of_the_birds_piano_sheets.pdf
    • http://mepadideboga.22web.org/31433154473.pdf
    • https://cdn.sqhk.co/solumapidema/Ejdy79R/poker_game_world_poker_club.pdf
    • https://cdn.sqhk.co/susojareb/geMhehi/drum_pad_machine_download_free.pdf
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/1266205.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_6f4de0376cbb464c93a4c885a33ef5e5.pdf?index=true
    • http://jaxojuru.rf.gd/20896237132.pdf
    • http://dovijurosovixen.rf.gd/74800803247.pdf
    • http://sikejilewiz.epizy.com/bangla_new_song_audio_2018.pdf
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_750b05e72ee8487a8f766a1569273adc.pdf?index=true
    • http://levewube.epizy.com/pneumonia_pada_dewasa.pdf
    • http://zegudonokor.epizy.com/82181004366.pdf
    • http://girogabunuxumu.rf.gd/alloys_pogil.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_0878ccbcb3724c5ca399c3c128c9351f.pdf?index=true
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_7b4f0176b8ee40a1a00a2de569027aef.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_off0000e26e.bin
fb75de95afd29a09c7d079cfbbf79d56e7e122dbfed734ccb87f21ff61f750e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 4928 bytes
font_01_sfnt_off0000f33a.bin
4ad11c813e46da360ff7d2756857c2e281e6500101d96669c4b7a6fb2108ec43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 11684 bytes

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