Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4b1f1e94ec667f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-10 18:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ca3c2188a8b8008af2828b9e996808ec SHA-1: cdb7a94ae5c0bcabac37486ecdd3ea0799cb4e38 SHA-256: 5f4b1f1e94ec667fd890d5b5cc9890c8a31d7798cbc439ef7b7a4f8f909b453b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary one pointing to 'resalured.ru', which is likely used to redirect users to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to contain keywords related to a product search, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/wb?keyword=roomba%20discovery%204210%20charger PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460048/normal_5fc8d09088282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_603c2a9ccf420.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/grade_2_math_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_601795bd567aa.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/zejipalumidab.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/eFhjPid/rose_gold_tablecloth_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/geMha8O/2404039828.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/dokunebufevosoxo.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/26804329930.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/hDicieM/samsung_galaxy_core_prime_instruction_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/cgfGl00/deathworm_ark_ragnarok_spawn.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/AUighd2/94143193822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_6003366d30ef2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fe4547d312cf.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/bimabiwutodawozibob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421207/normal_5fe4f4531573e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/69551381147.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_aa8314c30add4834b84e395bf68173fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/zakavekadufupojided.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/bluebook_congressional_research_service_report.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_01939e5d000b47969b0ad68a31aad407.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/what_does_the_bible_say_about_facing_your_giants.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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 6044 bytes
SHA-256: 901ed458018c40de57a8161845d43427a52f1198a2ecf5a1f29b1492b30fc6db
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 11320 bytes
SHA-256: 3a5251744a68b06c1a271e56132f1416090bb5908efa9f1edaf19f7f09fa4a20

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