Malicious PDF — malware analysis report

Static analysis result for SHA-256 5369827924deb078…

MALICIOUS

PDF

193.9 KB Created: 2021-03-20 10:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 457af4f4bdac2134313dca138d63a77e SHA-1: dced09b6ce9803414e58585edddeb4cc847583da SHA-256: 5369827924deb07887696154329aef99e1293cd1a2cc1206302462e4e383ac60
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'jacksth.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm on disposable hosting, suggesting an attempt to direct users to various potentially malicious sites. No scripts were extracted, but the presence of multiple external links and the classification strongly suggest a phishing or malware distribution attempt.

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://jacksth.ru/wix?keyword=jedi+sage+build+2019 PDF link annotation
    • http://netzamka.ru/evinrude_6_horse_outboard_motorz3lk0.pdfIn PDF document text
    • http://navaram.online/xogutugaxibogekivukexws7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fe7aff910603.pdfIn PDF document text
    • http://zavifuvalo.22web.org/7868536351.pdfIn PDF document text
    • http://sosed.market/advanced_organic_chemistry_reactions_mechanisms_and_structurerbch1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fff44c94e894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5ff44d944c7ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ff2a4203ed22.pdfIn PDF document text
    • http://jirafka.space/can_you_do_day_trading_in_roth_iraqhvuy.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/e49d995c-530f-4dbd-8488-3b2ec1e9cd04/kajinovarokipel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f319ec-22bd-4d1b-a037-e6d0571f0f4a/68471496004.pdfIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_f708fc0e13b146cd81ba17c72a0e9c84.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_3c3d560c3666474a821299dbb3e613c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7033dc-ad80-4e49-a113-6464020d75fb/dream_interpretation_dead_mother_angry.pdfIn PDF document text
    • http://xafapitadejafi.epizy.com/6939571660.pdfIn PDF document text
    • http://wupubobetob.epizy.com/90691589971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6ed54b-c429-4b95-a618-61b99ac62ed7/suluzozojeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c536b7fd-d05e-42ab-986e-4ce0111c19ae/92545662747.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_off0002b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B311 5508 bytes
SHA-256: 77c42a74f0c073cb5b2611b98578259475b790e868b87b069f875d48a068942d
font_01_sfnt_off0002c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C5CE 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0002ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE5B 12344 bytes
SHA-256: cdf9ee4d516b9f885297ad5f17d2e99ebf9224a36f706db6bd65c09666ab6714

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