Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ac0a07abe8d65c…

MALICIOUS

PDF

72.0 KB Created: 2021-03-07 21:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd7d00377e32e322e06464401a817195 SHA-1: 9fd33fd61f0c89951ff9a3ddd963be2f80f0976b SHA-256: 76ac0a07abe8d65c3c705ffbc4b776b75ba0ba8e4adedd126109b3b8376a74ca
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a specific UTM parameter in one URL points towards tracking or a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=rode+videomic+pro+ntg PDF link annotation
    • https://cdn.sqhk.co/midusuworab/vdjbJMC/mobozivikedivesofi.pdfIn PDF document text
    • https://cdn.sqhk.co/jewezaledev/hhyhbxJ/c_compiler_for_mac_os_x_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5fe35fc3c291a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_602c7863288e3.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/ed7YSib/wonderdroid_x_emulator_for_pc_games.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/8656433.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/ehfWUA4/sogisudixep.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/jggdgjE/2881885957.pdfIn PDF document text
    • https://bijesuvudapij.weebly.com/uploads/1/3/1/8/131860553/87e376ba.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/jeo825b/homemade_soap_ingredients_label.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/how_to_cook_waffle_maker.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/8059127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_600a59cee187e.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/saponoxifokebefovawa.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/giUidH2/30879936205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5feb78f352e56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_aadf9c998f57460e959b94c6c70ed80a.pdf?index=trueIn PDF document text
    • http://gidubabe.myartsonline.com/how_to_find_the_mass_of_a_liquid_using_density.pdfIn PDF document text
    • http://girofili.myartsonline.com/what_habitat_does_a_white_tiger_live_in.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_22a8ef1818984098abd88166f1d6cdbb.pdf?index=trueIn 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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 5040 bytes
SHA-256: cd812d30a26e7c708b1d56a780518e0e94d4989e23e32a000544ba083a88c416
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10624 bytes
SHA-256: 67f45e1c75b3cdff40c017812cbb757ac5e30c76c85af7359b6d856fc74a8ff9

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