Malicious PDF — malware analysis report

Static analysis result for SHA-256 58603a0f6ed23795…

MALICIOUS

PDF

76.1 KB Created: 2021-03-05 08:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6e967254f6956acdbdb9a7cd94dabdbf SHA-1: d7e7a6e020e039e29ee80a9426408c0f5e279404 SHA-256: 58603a0f6ed23795ea4d8c0a11b9f17543c3c53ca597147cde661da8fbe71dc1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('resalured.ru') that is flagged as a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

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://resalured.ru/strik?utm_term=que+se+puede+comer+despues+de+la+colonoscopia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465128/normal_603997041fce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6017f721719b6.pdfIn PDF document text
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/savun.pdfIn PDF document text
    • http://zejenaxudemato.22web.org/the_minstrel_boy_sheet_music_for_recorder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_6033016d496d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_600a407726595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fc62d83e2636.pdfIn PDF document text
    • http://xopeximitefun.iblogger.org/cryptography_and_network_security_questions_and_answers.pdfIn PDF document text
    • http://vitezozikupu.iblogger.org/what_is_another_name_for_jowar_vegetation_answer.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/33518c1eb03ac55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_602307c504452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tedawevoni.rf.gd/61762183288.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_cd89600d83734a148d63640209d8f141.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/181b439f-3400-4f89-8498-252d1a51889d/what_is_the_best_bait_for_striped_bass_fishing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ca28a1-e399-4e43-9389-5c44273adaaf/ruvetipikili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b2314f-6054-4a93-9cee-a80b6f23851d/history_of_islam_by_akbar_shah_najeebabadi_download.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_84b3386067e846979897c642cd4301b0.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_0672dbd772ea4bd2b364ab5b2dd85871.pdf?index=trueIn PDF document text
    • http://fofeparulofiz.rf.gd/2019_buick_regal_tourx_manual.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_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 5280 bytes
SHA-256: d55b5194d8c4437e43c056638bb9cede4bf53f332cd7afa5bd24da4b4634b975
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 11660 bytes
SHA-256: 14e62328b150d739334e6f88fc57bf2d7ed4e577241c7a499819fd8d4ac7464b

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