Malicious PDF — malware analysis report

Static analysis result for SHA-256 561d123db09a2938…

MALICIOUS

PDF

72.5 KB Created: 2021-06-04 18:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bf5ef01dfa5b48dd5daa39b18bacc780 SHA-1: a1b5be003b899d2c15a526ace9a1ca625eaaa816 SHA-256: 561d123db09a2938c6c37ce6613bc4ce766db42c2ab328564e8e5a4327b5f651
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://nomylo.ru/pbw?utm_term=cuantos+dias+tiene+1+a%25C3%25B1o PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426260/normal_602f1370950ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5fde33dc781a1.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/wesovakuriw_kiwewovufada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5fd7b733efeee.pdfIn PDF document text
    • https://judikojegewag.weebly.com/uploads/1/3/4/5/134583508/fududabajalozipison.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494452/normal_606e9a8ec95ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_600eb6dee09d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_6069fd3a5af68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fe02d1367bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_606e452ad056d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc7caaa4cdca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b399fa-5a16-4cfa-bf80-381ff376a3a6/46083514979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685da772-24df-42e6-bdf2-becee130efe4/51183537981.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144508203/38568892659.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144525300/gta_watch_dogs_2_download_for_android.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/what_are_the_characteristics_of_information_security.pdfIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144544275/emergency_animal_clinic_open_24_hours.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/bisorenoza.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 4860 bytes
SHA-256: 5cdbfaaa813dcb1ba8693f589e7080bfd5c9f3d4664f9e355830de719120116c
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 11624 bytes
SHA-256: abab846d6a31a12b10b4b7a7f5f821696288a126485de897fdbe41699f87100f

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