Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db8e96124798bce…

MALICIOUS

PDF

75.4 KB Created: 2021-06-12 23:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b3b19b839960d21eb6e9cac22d55736 SHA-1: 3cda6a8c2a6b3044b7a58dd947f49fa898d4a9f3 SHA-256: 4db8e96124798bcebf1c1e9eaa83c3ac923b69a2e7296affb55dc366c805ed3f
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious or deceptive content, potentially as part of a phishing campaign.

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://catamma.ru/pbw?utm_term=android+1+8+ball+pool+3.5+0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373517/normal_602d96ce844c9.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/jabajuxazagex.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/gowonogofilixexez.pdfIn PDF document text
    • https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/d3687b8c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6052d00300163.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/rarox-gojur.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4458421/normal_60b262cebd78d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_60b87a24ecaa6.pdfIn PDF document text
    • https://logugutixolug.weebly.com/uploads/1/3/5/3/135393325/1eed6bc4425db.pdfIn PDF document text
    • https://zagesugob.weebly.com/uploads/1/3/4/3/134379314/7917273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_60bd301dc5bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_60148d7d7546a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikovifif.pbworks.com/f/piano_rb_chord_progressions_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25444227-a8a4-4a62-b36a-3787a7e5305f/57336307487.pdfIn PDF document text
    • http://tagutijak.pbworks.com/w/file/fetch/144962748/the_bygone_days_piano_sheet_music.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/83787583096.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/14445755336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2f2899-95c0-4e8a-a688-bc52ead411df/60479018878.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/when_ps5_will_launch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289c7d81-716a-4c8a-986c-b19020a53f97/altered_carbon_season_2_spoilers_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3004c752-53a3-4773-898c-e0ffce543873/5636035965.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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 5612 bytes
SHA-256: ae136b56e992d85956c98a7a9118542c71e9098e1b4877aa16a170afe1c724ea
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10168 bytes
SHA-256: b732a5257dec2bcaeb54118e76fbd82d7359e4474cf579e2f54107d3e904578a