Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66ddc4a9d932241…

MALICIOUS

PDF

92.7 KB Created: 2021-04-03 05:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c4e2e16b5711f9b846aea2cd9c821bf SHA-1: c1d1d5cefae4b70c74cdcebcd4b443d27dc72fd1 SHA-256: e66ddc4a9d932241fe788270bd6fa3d4b9bf4889c71e25731c85f04119af1553
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded URLs suggest the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=cognitive+distortions+worksheet+therapist+aid PDF link annotation
    • https://jonilokakowoso.weebly.com/uploads/1/3/1/4/131453896/dugaturufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6040135d18c38.pdfIn PDF document text
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/9428a3a34beada3.pdfIn PDF document text
    • https://vujugorakiti.weebly.com/uploads/1/3/4/7/134719441/petuvefesiz.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/pefosiwina.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/muputun.pdfIn PDF document text
    • http://mmeueue.space/nom_036_stpser7ep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366331/normal_5fcf70ebc76b0.pdfIn PDF document text
    • https://nidapekosoko.weebly.com/uploads/1/3/2/7/132740606/400c40.pdfIn PDF document text
    • https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/gatovekifutudotevaw.pdfIn PDF document text
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/pakativ.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_6046ee245f402.pdfIn PDF document text
    • https://paparudedolenod.weebly.com/uploads/1/3/4/6/134686514/pawazolekedixatis.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/128993.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/e4d00.pdfIn PDF document text
    • http://naturalik.fun/bogopivygas.pdfIn PDF document text
    • http://oneitstore.info/tezumelivupixekadpvy.pdfIn PDF document text
    • https://woronawupewusor.weebly.com/uploads/1/3/4/6/134672267/nerekesafok_koleneful_vomidixepuvebo_jugurotedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_601479a5a566a.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/45127570-073b-4b47-9611-9d5bb8bf846b/73304546091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63657f69-a80c-4484-bc51-309849964cc5/a_world_of_art_8th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25063ded-8cdc-47ae-abf0-bb46bfd9438b/96432264953.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_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 5308 bytes
SHA-256: e8f4591277d1954fbe3490addfc48fb1bf409db1d5163e99e7d1343e3da92c90
font_01_sfnt_off00013efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFB 10776 bytes
SHA-256: 9b054d080816fbcbbd96fe94cae109aeba3d6e83a76a7ddc90eaec5f494dcd01