Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67f492b680ce423…

MALICIOUS

PDF

102.8 KB Created: 2021-05-07 23:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fdba8ec36c09c08cff9dd548f4f1807a SHA-1: ebfac37e110b676b016934e86c4ed4d897b5a29d SHA-256: d67f492b680ce423159c1c43f2c650fbe4ee233a368729650a630607bbf733ea
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs under the guise of providing 'Tamil romantic novels free download pdf format'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or malware downloads. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

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://seumenha.ru/strik?utm_term=tamil+romantic+novels+free+download+pdf+format PDF link annotation
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/e2d03936b2.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/vububolamosu.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/RRhjbn6/walmart_christmas_candy_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_604372c47627f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5fec1f153d9c7.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/melisobisidakamunanu.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/d8OEQjg/64500767382.pdfIn PDF document text
    • https://pirubanulap.weebly.com/uploads/1/3/4/8/134847944/5660266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471484/normal_5ffa2496ebd88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kufekuduvedeni.rf.gd/what_does_the_song_get_you_the_moon_mean.pdfIn PDF document text
    • http://gojofim.epizy.com/benji_bananas_adventures_apk_mod.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_737aa77b642948c3b7ecceac3ab535a9.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_43e92dae3da8482992f107daae933cad.pdf?index=trueIn PDF document text
    • http://gizamir.epizy.com/what_is_at_the_mountains_of_madness_about.pdfIn PDF document text
    • http://jenefidozepojig.epizy.com/wegobawegezumosawomam.pdfIn PDF document text
    • http://worurekebisur.rf.gd/67783386690.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_31e32f3f272b4964a3d6be6e8f523c3a.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_baa25928e0314aaab7604927d570c0c5.pdf?index=trueIn PDF document text
    • http://mukadepokexow.epizy.com/universal_needs_human_development.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 5400 bytes
SHA-256: cce5ee3e66c3802821f576bcc1f0683d41b8333ded2ba735ddee937fd43e53c0
font_01_sfnt_off0001413c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 7468 bytes
SHA-256: ba37fd806240566995f6c31469090d03bc8e1f50a4a6eea2acb10ee4dbdeb694
font_02_sfnt_off00015660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15660 17216 bytes
SHA-256: b90f42a01c73ac1880923d0852289f1aac45af15307c79ada48ae36e1e4fd146