Malicious PDF — malware analysis report

Static analysis result for SHA-256 3109964ee21ff236…

MALICIOUS

PDF

83.1 KB Created: 2021-02-19 03:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da9aca6850e1b3085f58e696d0c7545f SHA-1: bf7e502ee4aaf6d8fe46d16f08def7172b800ffc SHA-256: 3109964ee21ff236feb21d61e1dd759753961d8cfdd467867cfe9fc8c7516600
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic analysis revealed it functions as a link farm, embedding numerous external URIs, with a notable concentration on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=red+coats+from+pride+and+prejudice+world PDF link annotation
    • http://tuimag.ru/c_d_m_a_full_formpzpla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fd1fec8a93ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_602dc84aeb18d.pdfIn PDF document text
    • https://cdn.sqhk.co/dameseri/hghggje/orange_tree_golf_club_orlando_homes_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_5fc8d038d910f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_60265dcf6073c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_600fa58e5aaf8.pdfIn PDF document text
    • http://rutonujak.iblogger.org/84873414182.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/hdjd7KK/94154441316.pdfIn PDF document text
    • http://akmurzina.com/jefoxudinirqj.pdfIn PDF document text
    • http://mainsale.info/26042494779ucg71.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://kaxafedi.epizy.com/62763039494.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/90304701023.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_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 5360 bytes
SHA-256: b26c350569eb582f879fa505e95b6b23316b48383b420063eef7dbeb66f0cad5
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 10472 bytes
SHA-256: b43a824bb487e9f8edc5f533546e8ff2649a970c46b197956dc9f58d7141dcdd
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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