Malicious PDF — malware analysis report

Static analysis result for SHA-256 9166ffccd5c8d717…

MALICIOUS

PDF

80.3 KB Created: 2021-03-23 15:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cfb27c1340fdefcc1daa28a5894a4300 SHA-1: 20cd32a9c3411e12667daaddd3a7b35260f74a06 SHA-256: 9166ffccd5c8d717a3b2e4cbc7c2222d255445703fd2179d1bc05973dccaa4e3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic to drive traffic to malicious sites. The embedded content is heavily obfuscated, but the presence of external URIs and the overall heuristic firings strongly suggest the document's purpose is to redirect users to potentially harmful websites.

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://bologen.ru/strik?utm_term=percy+jackson+and+the+lightning+thief+broadway+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414173/normal_6008d8fd9c7fd.pdfIn PDF document text
    • https://wilewefat.weebly.com/uploads/1/3/4/2/134234777/4781435.pdfIn PDF document text
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/5367581.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/teorema_binomial_newton.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5ffa85afbaa58.pdfIn PDF document text
    • https://pozesipo.weebly.com/uploads/1/3/5/3/135346015/fetotuvaxo.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/gebonofokejopefawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417645/normal_60039544cec2a.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/rilumaraxo.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/nezemevinifewoxorazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480142/normal_604ed10801b8c.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/kiwagofegok-lebavujinuxo-tewegelet-xuzipirufojop.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/36327695008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5feebc793ac87.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/a77e734b-53ef-4bd2-934e-6225197701d4/77961050358.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/how_to_modpacks_for_minecraft_pe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a209f66-3f5e-476d-a144-3e121f886e83/19611132887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25259c57-fe5f-4798-b7dc-284e1209a019/0_to_6_months_physical_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d5d9cb-5292-43a5-a870-012b51a1ab1d/john_deere_lawn_tractor_attachments_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/coolie_no_1_bhojpuri_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dd0077-e69b-4a30-a705-9e9f4c3144e2/zivakojezimusivi.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_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 5816 bytes
SHA-256: 671d259670d36179b653f2244f93ddc0f226ca2a543b2c85a86b745c69545f14
font_01_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 10884 bytes
SHA-256: 0ff6929c2cbeace99fa86dc6e9415716c856266a56c3d82bec5432d77eb0a484