Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5206d52ce459046…

MALICIOUS

PDF

66.6 KB Created: 2020-11-26 06:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5675d7ec76be1dbc0cc584546ef62538 SHA-1: 162dcdf4575aefdc5d01a24d4e5d8ade4f256fa5 SHA-256: f5206d52ce4590460b1b033c94087b34ae5fddfb4c51c50c7231ca5baaea361e
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, and contains a critical heuristic firing for a malicious redirector link. The embedded URL points to `https://cctraff.ru/strik?utm_term=no+soy+perfecto+frases`, which is likely used to direct users to a phishing or malware site. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=no+soy+perfecto+frases In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f8f16643a3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444874/normal_5fbbc5559daf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5fbf2224ee2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f8d865d5afa7.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/zijivevip/infinity_blade_2_ios_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/17787886071.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/vanevaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f09290f-bd3e-45f2-a503-e939b0502c3f/lg_top_load_washing_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/55503433818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9d3a4a-f116-4e4a-84ad-d15bb0793592/horizontal_and_vertical_translation_rules.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_off0000c65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65B 5048 bytes
SHA-256: dbf28d31483e6dc6bedcf5859520cf005c52bb8f585400e389bd1a24c9824199
font_01_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 11432 bytes
SHA-256: 3a99dedfeebc8b774c6c1f5b8695e5f5b34dbd87f3c785b0f29eb09839de9ab8

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