Malicious PDF — malware analysis report

Static analysis result for SHA-256 44855a3e1cda9438…

MALICIOUS

PDF

72.8 KB Created: 2020-12-27 02:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 349de8f9a06002419f5e34607dc8ddc4 SHA-1: 833f437eeec0de646b8ba202054859906301b208 SHA-256: 44855a3e1cda9438da8e0453faffeaaa351a435bc523637a6046acc641ea33e2
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URI pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffe.ru/strik?utm_term=tap+the+frog+game+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fe7af4504cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_5faf11c2505d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f89fbaa9a1d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448100/normal_5fdf71e85e2e3.pdfIn PDF document text
    • https://wurumoziwozosib.weebly.com/uploads/1/3/4/6/134644160/cc17bdd8.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/xovajukoxin/nasirona.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/padek.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/critical_discourse_analysis_dissertation.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/adblock_for_uc_browser_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b615a34-8729-4d37-9ffd-3ad67e27adc8/causes_of_plastic_pollution.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_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 5120 bytes
SHA-256: 34b59dee01f72005b9e7f7da7b9e68456ae51208e0324a75d82e2d98d2341c44
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 10464 bytes
SHA-256: 549de80c8fa052c62138175ea6a7b2b4f8920faf7d0eaff0ae071e219c9f781c
font_02_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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