Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd1c449dca415be…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 16:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f8327edf3b25cbabfb67e83a3e50243f SHA-1: eebf34ba8edd3257f88e336c2746f1763f2e0699 SHA-256: 4bd1c449dca415be73782368f0734ed1993b49c537ad8ac1100aa0c4fddcfdac
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with several pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or spam content.

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://fokemale.ru/123?utm_term=what+are+the+stocks+in+dow+30 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fc7515d19552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_601a3c9ba661e.pdfIn PDF document text
    • https://motapesuna.weebly.com/uploads/1/3/4/7/134749044/rigisul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_601b85a7dfda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_600df7c070317.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/2jif6hj/kakewajelodavu.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/flCAz2A/reliance_jio_recharge_online_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459054/normal_60077d0940c78.pdfIn PDF document text
    • https://wisufomerimugil.weebly.com/uploads/1/3/4/0/134016782/8894589.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/sizovelubige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_602abf2f74e01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofawapedoguw.rf.gd/child_education_allowance_reimbursement_form_2019.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/21379137455.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/java_j2ee_interview_questions_and_answers_for_10_years_experience.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_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 5472 bytes
SHA-256: a9939b39ed1e87a067c56e46686a5149c4b6f411ac739534bce7f8bacdaf5794
font_01_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 11072 bytes
SHA-256: 3eab92961e3d9e00496b5de132c468a44f692b665daa5b0467e375e4324ba7a6

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