Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ace4570bdc215ef…

MALICIOUS

PDF

80.0 KB Created: 2021-04-01 23:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ba82350214c29be716f248b2d54c4366 SHA-1: aa5d49f0368a8df7517eb9e39f19b3a67f2f3636 SHA-256: 2ace4570bdc215eff2e82d2c46644728fd59995d886466600a3cc18b348d696f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a characteristic of link farms and potentially phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=electrical+cardioversion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423137/normal_604457cd68188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_6011897cca086.pdfIn PDF document text
    • http://wefufivubulal.medianewsonline.com/vofuziwililalibepunufikox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_6057f772d1e95.pdfIn PDF document text
    • http://fokikizuxijem.iblogger.org/beautiful_wallpaper_hd_apk.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/what_does_canticle_mean_in_latin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5fd9861fcd40f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_5fea08dc77374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_605917651134b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fe2a395663ac.pdfIn PDF document text
    • http://lajulufubugo.22web.org/coyuchi_percale_sheets.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://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_71a67c3582ab469d857812f02531cb5e.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_a1e37c7caaea4f31a58c6026262ded59.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_fdc6e593af6b433caac69012d2a154d8.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_ae479273a4094895ab8438b64700547b.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_9332465345954d42bbf995d0ed32849b.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_724661a300744a7bbdbd4c503c37fb75.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_31152f811a1c4345b47363f24c666356.pdf?index=trueIn 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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 4952 bytes
SHA-256: 8d926bf4431d9de09001595d4d5c1da8155d780b2eba286a1b9608468d1a8e2d
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 11052 bytes
SHA-256: 15482cb0172da5f274a8e680597ba4c40560bd65beaef79b38a5f356d3854988
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3