Malicious PDF — malware analysis report

Static analysis result for SHA-256 521955ffe71c7a43…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 13:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8cdf2d07a59eece25d4e73452165d910 SHA-1: 679b1b42aecafd50d953d44ba166b0b6f61b69af SHA-256: 521955ffe71c7a4397246ab70b0575f59be590588214f136b0b950a6bdeecb31
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=boss+dd-3+country+settings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367627/normal_60296e50b617e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_601d61399af9f.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/eTghMhn/josop.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/d6jcjff/car_logo_hd_wallpapers_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/LbijieS/55987286020.pdfIn PDF document text
    • https://cdn.sqhk.co/tobipamu/IjbJEJD/61626437556.pdfIn PDF document text
    • http://thefortykuti.com/124270094314rgpl.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/JETgeJH/praise_and_worship_songs_free_download_mp3_2019.pdfIn PDF document text
    • http://discovljzg.fun/vufututolugisovikinepumwv9.pdfIn PDF document text
    • http://vas-rem.ru/9917713361d9tf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383464/normal_5ff5d8c2dde55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_6016fa15ed4e7.pdfIn PDF document text
    • http://ralanizu.iblogger.org/category_list.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
    • http://dexixikix.epizy.com/59023460208.pdfIn PDF document text
    • http://kutijizon.epizy.com/characterization_chart.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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 5092 bytes
SHA-256: 0c4d79c6c788ca37657c89af62dfa4e71aee290a98cf3449d6ac3bdb31b88829
font_01_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 10552 bytes
SHA-256: 12903ecd32c956039b4fcda278918a279ff665c8d2e12e9578b9ef9f112c1587
font_02_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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