Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d1450b260d1034…

MALICIOUS

PDF

83.9 KB Created: 2021-03-20 04:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 35296fbb17d92c2fc0254430b4791b88 SHA-1: 9c9749380367370e93bf2497f5842cce54d14990 SHA-256: 61d1450b260d1034f250cde659ca2aec70d76cf8444e03f80eb823b99d1f2fff
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=declaracion+universal+de+los+derechos+humanos+1948+contexto+historico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501963/normal_6018ebb06d189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_5fe9345b8c82b.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/UFtAhh9/ice_cream_truck_sounds_1_hour.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/cjcgiij/sliters_ace_hardware_lakeside_mt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5ff27d1169419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_600e662d4204c.pdfIn PDF document text
    • https://cdn.sqhk.co/vinusubat/fhb1idu/capsicum_rice_sailus.pdfIn PDF document text
    • https://cdn.sqhk.co/mevutaxisut/fjc8RlS/lowawedutuzowowela.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/bFjctii/31050891722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455390/normal_600931bc0599b.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosozos/Eiithb7/ostrich_sans_rounded_medium_free.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/P0ihfha/gosaluwobodakumig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_604f5bb9993e3.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/indiaha/heart_problems_early_signs.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/jfhhQib/basifatemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_fede2d14edc643d08b790df77a4aeedf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/nirep.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/vefumel.pdfIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_6198ec3f75464e5c94d44d23b4750c2a.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_bf2713a581e64c0db0a5a0ff8067720a.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_c8442f139e094f90be2b5fd49d42e900.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/94599767707.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/how_to_connect_jlab_headphones_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/ram_bhagwan_picture.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_6698f7eeb0aa4dd98ab63fb92471ab91.pdf?index=trueIn 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_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 5796 bytes
SHA-256: 9f3e358679b008f0db8c8a36419fb0294a60258ea2ecf939e8b1267ddfd572d3
font_01_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 12336 bytes
SHA-256: 01a8f05510d5d64ededa480e4304506055d7e1fa05755b6670c14d73a2e4de84