Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c3599835dabe7e…

MALICIOUS

PDF

78.3 KB Created: 2020-12-15 03:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a36b0a2af50d034cfd78b51934008902 SHA-1: 4f5c56ad2c4d6272b25b12e4e01688c6d921ee48 SHA-256: f6c3599835dabe7e6a6441ba8f3eacae1850f0cd6d650c1ae87fa67cbd241e90
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely lead to malicious content or phishing pages, and the document body, though garbled, appears to be a lure related to 'michael jordan cards'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffnew.ru/123?utm_term=most+valuable+michael+jordan+cards PDF link annotation
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/9094220.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/fexage.pdfIn PDF document text
    • https://vejefoxebeses.weebly.com/uploads/1/3/4/8/134860837/wurabakinetixufopo.pdfIn PDF document text
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/wobojulomi.pdfIn PDF document text
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/dutijufi_vawelu_taxetobike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fc92b3bc4451.pdfIn PDF document text
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/faxanasagonewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5fb9cbdd408d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5fbd659cc4457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fba6b9e48bbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zakunafu/report_reckless_driving_michigan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 4764 bytes
SHA-256: 02d564e5d1ed429a6030f97d5aa9fd6df08ffc7c6f83911fa8fd1ea89fc305d6
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 5344 bytes
SHA-256: 64f443196958af9fa4299af9204ff514aeaa03caefe2af7d8e34a255716d8b83
font_02_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 11540 bytes
SHA-256: 3115ddd6558bc3121ae2cb761f2fa00e381598ec7f67d5048041a3c8f4bba0cc
font_03_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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