Malicious PDF — malware analysis report

Static analysis result for SHA-256 685c06a94e307926…

MALICIOUS

PDF

81.6 KB Created: 2021-03-19 15:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8cc2c5ed3df487d9d1a20e5726341a8 SHA-1: 2344dd2275c991473bc3e00e836e107f33b0ffed SHA-256: 685c06a94e307926401d889a3678d921290896da2e7f4e6cef8bfb1a9f7caf9d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. ML classification and ClamAV also flagged the file as malicious. The embedded URL suggests an attempt to lure the user to a potentially malicious site, likely for phishing or malware distribution.

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://dafemum.ru/strik?utm_term=what+is+a+calorie+simple+definition In PDF document text
    • http://itali-big.space/47150206148ahi1x.pdfIn PDF document text
    • http://hook-up.fun/how_to_do_swot_analysis_templateg2yip.pdfIn PDF document text
    • http://kindraretterath.com/battle_chess_game_of_kings_tm_hd_pc_gameplayk8501.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/dPgghhW/superhero_ninja_creator.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/3Mifsjc/garnier_charcoal_sheet_mask_ingredients.pdfIn PDF document text
    • http://stavki-na-sport.site/bewakudulibitizulvzt8.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/sabobenuwe/35387892515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50ba4db-56f5-47d6-8af4-b9d3d7295000/razagugokepixesolo.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/google_spreadsheet_count_occurrences_of_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/monodapagizufuk.pdfIn PDF document text
    • http://wegoxoxajenugol.rf.gd/xemudedubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc3036c-2b42-4b34-b9a9-4144a7c83668/31038952640.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/scholarship_award_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/addition_problems_worksheet.pdfIn PDF document text
    • http://newixisuzale.epizy.com/how_to_change_file_to_word_doc_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d128691e-d3b5-4485-b111-420231e7b5a2/frigidaire_fad704dwd_energy_star_70-pint_ontvochtiger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77e9efa-91c6-4fcc-b73d-06c8d3ee0e79/how_to_lose_weight_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/pidikeripe.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_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 5408 bytes
SHA-256: c5f7e6ce329b809a0a744733bc266c87e2c0f425837afbe05982add2ed72b457
font_01_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 11080 bytes
SHA-256: 8dd294b0dcac84940f63097a22eea1038973f674fe09980bc32c763e07eb69d9

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