Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fade528ec009a4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-29 07:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ef4b10890823cd50cf81f956e965024 SHA-1: dd5ae6fa7c4099b66f777c17df55cb153c4602a3 SHA-256: f6fade528ec009a48464099409bdce559a586a0b518e57bcb7b73b3029aa8d2e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/123?utm_term=video+maker+app++play+store PDF link annotation
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/sifivudu_rovasesi.pdfIn PDF document text
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/8028057.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/dixeworunowolulitab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_605cff6418e19.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/2cecb869c5a731.pdfIn PDF document text
    • http://sivesesugipode.scienceontheweb.net/agriculture_grade_10_study_guide.pdfIn PDF document text
    • http://moresukko.ru/327933511793nqup.pdfIn PDF document text
    • http://hellovendi.com/xonowuvugugupopixirajo5ey4q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_602ae044dc44f.pdfIn PDF document text
    • http://womenita.fun/192519187947sfcp.pdfIn PDF document text
    • http://afracheat6.xyz/nationwide_directors_remuneration_report_2018p2xq5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_605bb94b94ea8.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
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_4587736dcb9d4fd6bb24d7d2e95e237c.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_09eeb637148940e1bc7358e007a2526a.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_e91c176692e24754ba3a38128e19f695.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/apnea_del_sueo_fisiopatologia.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_bebfcdca4a8047ce80c1efb1ea5d42a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/divinif.pdfIn PDF document text
    • http://gitodake.myartsonline.com/55001762664.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/softball_uniforms_adidas.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_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 4920 bytes
SHA-256: cb5c837718619d8bc25f629bd7c082fb3bec08efa32ec1a655ab51b665d7d4b3
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 10508 bytes
SHA-256: fb279aa5775f58e26b2d3652453f9549baa5bed444dd1dfbe7f80e93c566d736
font_02_sfnt_off00012434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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