Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec81c9c46a08423…

MALICIOUS

PDF

69.7 KB Created: 2020-11-24 12:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c4006e12fb54debebe3f81a842833348 SHA-1: 7ffc95e2346fc630f91752899b8344ff0f7d5ac9 SHA-256: 9ec81c9c46a084238ccf971f3123bbd3c20b4536fe9c89e6f73afee61737fbe0
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 'https://cctraff.ru/strik'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'primers', likely a pretext to drive users to the malicious URL.

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://cctraff.ru/strik?utm_term=how+to+dilute+primers In PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/dimaxorozumitak_giditer_sosenowovagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8a1fb9525a8.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/tebolenamalelojeg.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/jerer-kiwaxakanovasi.pdfIn PDF document text
    • https://zifizegesug.weebly.com/uploads/1/3/4/7/134719454/638818.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/jojitagifuva/etymological_dictionary_of_the_slavic_inherited_lexicon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1142337b-d2a5-4f39-ac5f-6e1c81676c3c/disney_new_streaming_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3f8cca-3343-4b94-9350-4641fa70878f/fly_girls_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4113caba-789a-48cd-b9ce-69b35dfcffd3/worisobumire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61458ff5-0cc4-4e04-9aca-00148ab316ca/nojatigabokejofazinebipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cc607a-e5f8-44c5-9a78-f12f73ed2ce7/81254951564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e9e138-d402-4ef6-a593-d0d0acd22cb4/76834229915.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/yeah_toast_song_lyrics.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 4948 bytes
SHA-256: f47d665905f8f9509f09118dd7c703cb032c876ddb683a53a04280b9fe1cec69
font_01_sfnt_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 11048 bytes
SHA-256: 4a8e6bf5e4ea32e1eef39560f48735766cef1bde250c78ddb38e31193a221b64
font_02_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 16064 bytes
SHA-256: 87bac7116cce17a810d08151410b930347e6d8b8f011720992609d67c697163a

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