Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5a39fc77b88daa…

MALICIOUS

PDF

82.6 KB Created: 2020-11-17 15:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 04399bb870f4c0f86f74fde4c97277d2 SHA-1: 1e5c2871b77553e1a8f81bc7f3d44dc5892835c2 SHA-256: 7c5a39fc77b88daafb48d85f7c52d529ac51b4341327583a9a10f07e0c34464b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely intended to direct users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?utm_term=how+far+is+200+meters+in+blocks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_5faa503338f12.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/1d4047ddae40c6.pdfIn PDF document text
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/e5cd1.pdfIn PDF document text
    • https://ziridizozavixik.weebly.com/uploads/1/3/4/4/134400570/964163c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f904422ee170.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/vedirivironin.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/de227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_5fa848102e270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3c074f-6d14-42c8-ad7b-f55c24841638/dotelidewuxurefinajezer.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/exercices_corrigs_atomistique_s1.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/espresso_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8925bb-4548-4098-85a2-8c96d20fa830/45138380500.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/bufaxuzojezatepufuton.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/wupopowus.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/60080472363.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_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 5560 bytes
SHA-256: e408b6fde3161c73c6c44f4c5eb7be826fe580a01efbd1acb90479f471049b7f
font_01_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 14584 bytes
SHA-256: 6d43f6e3501ed3ef98f18de1926c079b3a0f9498518dd78e526ed5dc70175721

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