Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c403d9514d47f58…

MALICIOUS

PDF

76.2 KB Created: 2021-05-18 06:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 268e21b80e505ea54910b9957dc38298 SHA-1: 1ab8275339e38a4097825b6c78196ec5f356734f SHA-256: 7c403d9514d47f5813bc554f4396305dac5245bf644ae987ef0a0287514be4c6
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 0.9997

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://ponafet.ru/strik?utm_term=short+autobiography+sample+pdf PDF link annotation
    • https://jokanile.weebly.com/uploads/1/3/5/9/135962808/78271b1f91d.pdfIn PDF document text
    • https://rewizefugubopu.weebly.com/uploads/1/3/4/2/134266162/1621510.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/raxoxonu-nejefikimupunom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2f0e4ef95.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/482b285.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/2026981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_601e1a4f4ea49.pdfIn PDF document text
    • https://vivusujode.weebly.com/uploads/1/3/2/6/132682813/d0de2d776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483089/normal_60067fddb4a6b.pdfIn PDF document text
    • https://lupoleleki.weebly.com/uploads/1/3/4/5/134516255/1070386.pdfIn PDF document text
    • http://jutereli.iblogger.org/mapusamutejowuradazimedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6013143c2bca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_6011751fbe917.pdfIn PDF document text
    • https://fenanasu.weebly.com/uploads/1/3/1/3/131384656/dopugobipukipesina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/777ad2f1-d791-46eb-b3d5-36f5f41981ad/plantronics_voyager_legend_charging_case_leds.pdfIn PDF document text
    • http://fegidil.rf.gd/dokolorepexuginolukimit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09891564-e277-459f-a373-ae49b1efc856/4777309101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f8635e-50ea-4e1a-acbe-b4fece2804a2/bowflex_xtreme_2_se_leg_workouts.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/9670602995.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/blender_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/komek.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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 5800 bytes
SHA-256: f3885e6ad439238957f94842a2f34f0b547040e6599a28c61887b876aff44327
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10132 bytes
SHA-256: 9e1aef2d3517965ae24f3ae4ec60b537d3491765efcf3d7575bfdf82e1adc8d7

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