Malicious PDF — malware analysis report

Static analysis result for SHA-256 29515ce4af771cd8…

MALICIOUS

PDF

69.9 KB Created: 2021-01-12 10:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d39e3899a5e03d9f5fd13618adfeb2a4 SHA-1: 9766357c3da8b4396efe62b89e9a4c8f8909e910 SHA-256: 29515ce4af771cd855223183559ff20566723ae06abbd5a69f3ba4c678c592fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are designed to create an SEO link farm. The primary URL, 'https://traffking.ru/123?utm_term=water+dispenser+stand', suggests a lure related to a 'water dispenser stand' to attract traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=water+dispenser+stand PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412387/normal_5f99acd75845b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5fe459233fff9.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/gjcOibV/vubulo.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/Ojjy8tb/92089792128.pdfIn PDF document text
    • https://site-1178022.mozfiles.com/files/1178022/nosazotib.pdfIn PDF document text
    • https://tijanowu.weebly.com/uploads/1/3/0/7/130739502/bujijinagix-fuleve.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ib6hfEb/tidiripilefuruzan.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/vobafemuvonasew.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/4288c3a.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/8FLquo9/29056120190.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/bizamesuwepe/face_shop_sheet_mask_blueberry.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/rotex_pneumatic_actuator.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/bus_ticket_format_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 4612 bytes
SHA-256: 6d4e914c49c457a18b79fd765fee066e4b3064c9308f74513927a338fffb7c52
font_01_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 10904 bytes
SHA-256: b739c62aaf10f3717a92958907aea4447462b166082754fbbb4a8ea6c8688f35
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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