Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f72c6732501f52…

MALICIOUS

PDF

70.0 KB Created: 2021-03-05 02:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10948862337e7f82b21f45aea0692ef8 SHA-1: 16ed3b0d3ec188b934a4e52bb401d9b78f45a130 SHA-256: 86f72c6732501f523708934a83fc2a12dcb164a61b0c88bb3c153a3b86822289
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to academic content, likely to trick users into visiting the malicious URL.

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://midufefew.ru/wix?keyword=acellus+answer+key+geometry PDF link annotation
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/kitilafaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_603d46993ce56.pdfIn PDF document text
    • http://likujodofefa.22web.org/claudinho_e_buchecha.pdfIn PDF document text
    • http://sejapamuji.22web.org/65247376442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_6040c3531b501.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/janowojojexapodadiz.pdfIn PDF document text
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/a8841cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_60134ef3ca265.pdfIn PDF document text
    • http://teksol.xyz/161370411619pzxn.pdfIn PDF document text
    • http://repair-planshetov.ru/raruferamurolunavuzawuvws7d.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/54221a01-3dd8-422e-beac-b4d8616500dd/who_discovered_electricity_first.pdfIn PDF document text
    • http://pabisuf.epizy.com/functional_programming_tutorial_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a5993c-b45a-4de1-ace9-30c677bd37ed/27031357169.pdfIn PDF document text
    • http://semerobaragizeg.epizy.com/89375512782.pdfIn PDF document text
    • http://xufoxozotelu.epizy.com/game_apache_air_assault_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38634ba-f089-4153-b3fb-77e2c4ad921f/my_school_life_essay_for_class_2.pdfIn PDF document text
    • http://wigugagekubog.rf.gd/atom_platformio-_ide-_terminal_windows.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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 5368 bytes
SHA-256: f3abade9d637888ab9396ac542bd30d9598ca7abd51779946a55d0414802e644
font_01_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 9740 bytes
SHA-256: 6f3566c9cb66e298a2e549e84eaa7d7bc86677fa443e747296fce3f365a9f72b

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