Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1478bd408540bc8…

MALICIOUS

PDF

73.2 KB Created: 2021-02-13 03:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38159e306f67b62ff61c97c9b62c9cec SHA-1: 15fe52dc6a08ae66dfc2c6315d9281d29472b753 SHA-256: f1478bd408540bc81f2107b6c20332b87464acb10e293841bc26c010e2e0c63e
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a 'manual definition and characteristics'. The presence of embedded URLs and the nature of the heuristics strongly indicate 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://bologen.ru/123?utm_term=manual+definicion+y+caracteristicas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456712/normal_600f5ff436a24.pdfIn PDF document text
    • http://mangalvpodarok.ru/yellowstone_national_park_camping_rulestiyez.pdfIn PDF document text
    • http://dolinunuridaku.iblogger.org/detroit_become_human_interrogation_3_androids.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_601ab05ed0e96.pdfIn PDF document text
    • http://creditscoreusa.info/awadhesh_premi_2019_dj_mp4eczsg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fd7dfa9ccf77.pdfIn PDF document text
    • http://hookup153.online/430083122529svil.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/xudiralixuru.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/ijjy1jb/xopunenat.pdfIn PDF document text
    • http://zubosoxi.22web.org/pubg_mobile_emulator_detected_bypass_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tarobajasupimi.epizy.com/pinigerasewi.pdfIn PDF document text
    • http://sezajuvijib.rf.gd/circuit_simulator_free.pdfIn PDF document text
    • http://dibulazovila.rf.gd/vshare_for_mac.pdfIn PDF document text
    • http://jujewejono.epizy.com/awful_auntie.pdfIn PDF document text
    • http://pofomabagemekut.epizy.com/fanivirozo.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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 5004 bytes
SHA-256: 0d8d74025cac73f2bec38953355ebda964ec8e511a2781ecc4aa03525fd5c7d3
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 9980 bytes
SHA-256: 22cd85134dbdc5fe0f0c4eb2aa718476ae39f9fc7128d9ac4802d87e2dfb8281
font_02_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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