Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0efa229a6e8e89b…

MALICIOUS

PDF

72.4 KB Created: 2021-02-11 21:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3cc1d464b8d3bdd5cebc93f3dc7cfb04 SHA-1: ea4e5af8ecddd524befb6fb692f2221897c9a0bb SHA-256: d0efa229a6e8e89bda4bf1eacf2b3eee134892e0e3e523cbbdb2de06fc445f4a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/123?utm_term=northfield+public+library+jobs PDF link annotation
    • http://torevifij.iblogger.org/dilations_worksheet_with_answers.pdfIn PDF document text
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/6679805.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/e9c3bf1.pdfIn PDF document text
    • http://mexicotop.xyz/free_natal_chart_compatibility_with_birth_timesuo4hq.pdfIn PDF document text
    • http://jetelijunejuk.iblogger.org/38605204521.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/jThduje/82112713515.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/hfjjLhc/viwinekasupemireka.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/nonado.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/cP0yihO/gallery_wall_ideas_behind_couch.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/xesuverawet.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/ehjjf4D/nba_2k20_ost_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwawilif.epizy.com/autocad_3d_free_software.pdfIn PDF document text
    • http://xofelipexagimob.epizy.com/hubba_hubba_nx_2_ground_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/72416325345.pdfIn PDF document text
    • http://pepojugatidi.epizy.com/7_little_words_bonus_answers_july_29.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 5532 bytes
SHA-256: 333bfc5c597fd51a10cc593c9b126b7cfc8db6082f9dae389775e37a6ce7f78e
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 11196 bytes
SHA-256: 8815f374de2c8aeee2e1a31a83e47955f89b3f382e77e67eafeed50b227a08f2

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