Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5803b628e19bac3…

MALICIOUS

PDF

164.7 KB Created: 2021-03-20 15:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2263dacfd0d982e614c7ee1bdb0b54d9 SHA-1: 566591324e97f05eefbe82bfe3a5b655fba43ee5 SHA-256: d5803b628e19bac3d70545fe24b0e46b36680bb170aa6d3055a722b69637f793
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/aws?utm_term=where+does+the+first+trial+of+barn+burning+take+place PDF link annotation
    • http://salonlabs.xyz/920093462060347o.pdfIn PDF document text
    • http://matrixbicycles.com/vavugivojikigoxiwufiwajw8tkl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6048f77f85b4d.pdfIn PDF document text
    • http://copyright-notice-ig.com/mawojoe5kgi.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/gjggiXI/39510142863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393785/normal_60076670c218c.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/iyj2hgD/myaicampus_art_institute.pdfIn PDF document text
    • http://baby-slings.ru/fojidokdg4m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_604fef9207f1d.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/ifhcghm/consumer_reports_winter_tires_canada.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/88064999260.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/hjjOibd/2294738071.pdfIn PDF document text
    • http://d-youtube.com/79913153799fc7g0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_6005fab91b35a.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/idNshi6/snake_plant_light_and_water_requirements.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/venazebexedadiro.pdfIn PDF document text
    • http://my-credit.info/guardian_tales_guide_world_2_hide_and_seekxapds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setikizo/21270354059.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/purim.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/death_cure_movie_cast.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_off000249cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249CB 5636 bytes
SHA-256: 0ed1451655e1a2b87a18fe07fcc58b609cd88b6f0fee15f6336628fc7903195b
font_01_sfnt_off00025d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D01 11364 bytes
SHA-256: bfb408cb1f0bc2248d068b18e15d2909f40cb07f37742ccb9f0f4e611b4df7f2

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