Malicious PDF — malware analysis report

Static analysis result for SHA-256 204a6b1d9cf5fe27…

MALICIOUS

PDF

73.4 KB Created: 2021-03-10 23:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a650c7da3cf06259a9935dc5d21bf5b3 SHA-1: 202a140d867f4d47b6d4a86f5f50307a24a37ea2 SHA-256: 204a6b1d9cf5fe2774212e4195d60704614fa929b5f3fad805704817701f98cc
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL points to 'yafferge.ru', which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and the malicious URL suggest an attempt to lure the user to a harmful site, likely for phishing or to download a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=stretching+exercises+for+lateral+epicondylitis+pdf In PDF document text
    • http://linavaluviriv.getenjoyment.net/auto_electrical_wiring_basics.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/waste_king_legend_111_reset_button.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/nenumebirovudotavezuxil.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/roland_td_30_hi_hat_problem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_5fdb1c2b564e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_6006a6382c982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/97691869779.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/vitez.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/how_to_connect_bose_acoustimass_module_to_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/please_answer_the_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/weather_report_kohat_division.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a5f2da-d6d1-472c-8e56-43dcce238102/sevidej.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/amarakosha_in_sanskrit.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/thermal_insulation_sheet_bunnings.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/14477789128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7d88f1-e650-4837-9d23-4371080f4873/can_you_trade_options_on_thinkorswim_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4efb8e-f5b6-4236-a70e-ca48b31f5d1a/does_walmart_do_returns_during_covid.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 5692 bytes
SHA-256: ee91a1e7470bb8c0a37ab870aee2cdf6a5c26e86dd51054fd803d4c16a49e78d
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10524 bytes
SHA-256: d7fcfe37553f3a45ba3074b3be7d4e850d11478e6940e05ddf8ac4b634bf2767

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