Malicious PDF — malware analysis report

Static analysis result for SHA-256 c741e1dcb913a4b3…

MALICIOUS

PDF

71.9 KB Created: 2021-02-26 04:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d2fb63a3492692b1cb82eb634f15726a SHA-1: b055b9d92a77967fa57a5199ebf1d49447f4a04b SHA-256: c741e1dcb913a4b3f8f98c3b58c8acab79db5b352deb3d5b6e2dc9edb515468f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a study guide, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/wix?keyword=structure+and+properties+of+matter+study+guide PDF link annotation
    • https://pivisagut.weebly.com/uploads/1/3/2/8/132815367/fetokewim-zejiverani-visigalunuwo-baviraluv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd641f3ed8c3.pdfIn PDF document text
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/xebibugulenusumapa.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/gagiw.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/lufizoveganikosalezun.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/60496462386.pdfIn PDF document text
    • http://retys.space/dufanilapov775e8.pdfIn PDF document text
    • http://hamlikjorettoop.ru/arjun_reddy_telisene_ringtonesxy91d.pdfIn PDF document text
    • http://thelandofbadideas.com/bifujeposupumns9xs.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/nagumi.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/9691704.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/70012470667.pdfIn PDF document text
    • https://vomuribo.weebly.com/uploads/1/3/1/6/131607062/4950957.pdfIn PDF document text
    • http://vittorguxx.site/27037950275b22oc.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/3152451.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/4414061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudupaxub.myartsonline.com/rocket_stove_combustion_chamber_design.pdfIn PDF document text
    • http://xasidulijev.rf.gd/brazilian_jiu_jitsu_theory_and_technique.pdfIn PDF document text
    • http://vabagez.rf.gd/un_fact_finding_mission_myanmar_report.pdfIn PDF document text
    • http://girafarurogu.rf.gd/dovekoxesola.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 5648 bytes
SHA-256: b512e0299a5e4213d6e52b9416b917b5de068a25cec0cf67a2a4a4e5984255fa
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10080 bytes
SHA-256: daca76a0b47ac5b939c2e7fe78f36e745a359444b1dd96312aecef96f6d5b423

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