Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f6fa483fd77d5c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 06:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1c6c63cf9e45d6d1ac19555215cce417 SHA-1: a14a790d582fa0287cc09c6306874e99b237252f SHA-256: e8f6fa483fd77d5cba4c08ae110b9ead353a8f615c38387059be6b3d66b0bc4f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm designed to attract traffic. 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 embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wix?keyword=coordenadas+geograficas+a+utm PDF link annotation
    • http://mivejuvididu.66ghz.com/sqlrpgle_free_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_60049fb312f8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fc5b8a755892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5fd1f29a55df2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_600482340b017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5ff9706507d0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375522/normal_60027bf7bf376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekowezitodog.rf.gd/53425521374.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/97457683589.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/26238356760.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_5e03cce60ff04d9d8e03708907e11d1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/towixota.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/40623515848.pdfIn PDF document text
    • http://ribigilubawedom.rf.gd/panokam.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/xipisevuwilun.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_4357df9c9f354708b69c649d663975be.pdf?index=trueIn PDF document text
    • http://limixumijegaf.epizy.com/detevorowajuweligesow.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/lojudet.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_dd12087a57974c58a2bd6df89c584846.pdf?index=trueIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_10ddd54ee858450b9d8f92e0240bff22.pdf?index=trueIn PDF document text
    • http://welididoseburiv.epizy.com/who_do_intps_get_along_with.pdfIn PDF document text
    • http://sidalep.rf.gd/62575074768.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 5212 bytes
SHA-256: 107a809572caae930157bddaa9fef4c2a0ad9244ceb81c5ba6c28be00d7ebb2a
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 11900 bytes
SHA-256: 35ffe48af855264b829cbd31df407ab9bfc083fc9576397546f43d033cbd2483
font_02_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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