Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c216b2b5039503…

MALICIOUS

PDF

90.9 KB Created: 2021-04-03 20:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 13e0cf0cf98ab2d07f53742f5f3b792d SHA-1: da0d74f7b0d7dfbc244e314278668733493991ab SHA-256: 92c216b2b50395033ee706f59bbf4a8a3a5633d4a108d0f927eb9ec859c3bf3e
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URIs, with a primary lure of 'free gmat practice questions and answers pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/123?utm_term=free+gmat+practice+questions+and+answers+pdf PDF link annotation
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/dovetizitazizakomi.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/4279014.pdfIn PDF document text
    • http://masajsalonunuz.com/holt_physics_worksheet_answersftpqm.pdfIn PDF document text
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/wiposijuxar-padopogupatis-bupisadikejitos.pdfIn PDF document text
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/72734e2caa0514c.pdfIn PDF document text
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/puvidumin.pdfIn PDF document text
    • http://beautysale.site/dictionnaire_anglais-_franais_editions_larousse_apkj6ree.pdfIn PDF document text
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/dajomob.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/zewepedisoj_dizamavew.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/jiwilalakomejubibus.pdfIn PDF document text
    • http://vasazuruxu.iblogger.org/52735851343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_f00526eb92124e0281512b99bdb932a1.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_f4928979cfe54a73895f05c971bf6375.pdf?index=trueIn PDF document text
    • http://bavabime.rf.gd/email_marketing_platforms_list.pdfIn PDF document text
    • http://sukuvafeliji.epizy.com/totalanegox.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_c0650fe491204a7997cddb154b94f23b.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_adc60e7c5226423f84c6ac78bf62cdfe.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_9f94de8942fc4934a44a465254ef2734.pdf?index=trueIn PDF document text
    • http://finuponazed.epizy.com/noretefafomo.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_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 5616 bytes
SHA-256: bae8903b2dd4144fd846390c91af3f2b41d8c4c2eee947b24ed673855609a711
font_01_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 11260 bytes
SHA-256: 3c8534e9e083ee3b7970edd2e2cde83eee92ddcedf2128e0efe42a0a98de066f

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