Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9726ad0ea7234c4…

MALICIOUS

PDF

71.2 KB Created: 2021-01-06 01:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d887b93a9707c84f4b7b8d0ba9b31714 SHA-1: 83ebc4fb20e773ff26dd49c7e29e0fb9f9f84da4 SHA-256: b9726ad0ea7234c40cd1fc4baa95946fe286fbf9aa1658fc9aa60da5261215aa
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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, specifically 'https://cctraff.ru/aws?utm_term=fire+background+images+hd+1080p+free'. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The document body, though heavily obfuscated, suggests a lure related to 'Fire background images hd 1080p free', which is likely a pretext to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=fire+background+images+hd+1080p+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5fe1c1d88f16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5fb6b1cfc1ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_5fad9fd40b029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_5f9f843e328f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5fcdd380a2496.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/xamibebulosaxug/skyrim_creation_club_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/fufazozokefepudataga.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/56870490686.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/80881856757.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/alone_profile_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/images_of_tara_perry.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_off0000bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 6084 bytes
SHA-256: 431ccb200e3dc48434618f2f55eecd6d4e770500513231ec8d146e1992875ce5
font_01_sfnt_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 10868 bytes
SHA-256: 53c6665014be59b7ce1fa42e96ad0c539e1a3abe1345775084f817fa7229cfc4
font_02_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 17072 bytes
SHA-256: 3e38b846b2d947436a2cc293b05ea3b542029831b321c098d25aa635dd6bb2f8

Open this report in the interactive analyzer, or submit your own file for analysis.