Malicious PDF — malware analysis report

Static analysis result for SHA-256 c731152cb276acb3…

MALICIOUS

PDF

76.2 KB Created: 2021-03-31 23:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: da704d48c1716aca7bfe0545d96741e5 SHA-1: 99edc945d0035560971ef4d374602cbb5087491f SHA-256: c731152cb276acb346ef678a4c7d3eab2b651cbe0cf2dcaa2b7cb628f05660e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=frc+game+manual+part+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498882/normal_600d1b7139bff.pdfIn PDF document text
    • http://4bochki.ru/is_there_a_sequel_to_the_girl_with_the_dragon_tattoomzbhw.pdfIn PDF document text
    • http://esagafow.fun/what_amp_breaker_for_lincoln_225_arc_welderjkl6v.pdfIn PDF document text
    • https://nixalimug.weebly.com/uploads/1/3/2/6/132680811/temadojibizo-ronexof.pdfIn PDF document text
    • https://cdn.sqhk.co/nudorijoraka/eieBic0/water_conservation_coloring_sheets.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/tovawoxa.pdfIn PDF document text
    • http://nakrutkavk.site/alfonsina_y_el_mar_partiturat9lvu.pdfIn PDF document text
    • https://cdn.sqhk.co/bujugasefoli/geMigkp/44194096368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486054/normal_5fcbf59385f43.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/jg2J4hd/gozoviw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5fc7fd95ef886.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/jggeXhf/zutuguzokaletixide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485591/normal_6000a4254ca6e.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/yheY7hg/mupepupufisoxewelulo.pdfIn PDF document text
    • http://redit.fun/68688397126a1x9z.pdfIn PDF document text
    • https://xuvelusikifaza.weebly.com/uploads/1/3/1/4/131406656/45433.pdfIn PDF document text
    • http://axecheat7.xyz/95009858040b6u2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_b28cd5da54224b01bb1eefa64e2d2d6f.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_e3442fa19dc34a91be934eae73dffa8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7967c426-bd89-4efe-9b1e-4f51a4a6275d/bixizexivajabarezid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e86331b-035f-419e-8adc-bd6da457cc92/45855622781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1192620e-0c8a-4f24-9f2a-4a01137fd494/what_is_chronological_structure.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_2b56489fc83b4887b12efccb3fc907b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2067c92c-23f6-48f8-b3d8-c7b3b6634dc0/officejet_5740_printer.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_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 5164 bytes
SHA-256: 17533a432bfdbb4f666d092de482d9b6c676aa42ab25b9df9d2275b518e774a1
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 11352 bytes
SHA-256: 3f63489060c56f60bb8860124dd5cd2399510a7c8895c43a24af3fd283849365

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