Malicious PDF — malware analysis report

Static analysis result for SHA-256 82438a454c3862d7…

MALICIOUS

PDF

86.0 KB Created: 2021-03-08 23:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dec09be3194e764bd2c28b560a382d76 SHA-1: ef23aba126645975a8fbc4b19c78aaa100d56ccb SHA-256: 82438a454c3862d730a105bce836015b1a59df5fa1af4511ea347cdf7d99e80d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection scheme to malicious sites. The document body, though heavily obfuscated, contains metadata related to approximation and estimation, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/award?keyword=approximation+and+estimation+pdf PDF link annotation
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/kikitavi-virobonozazu.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/a06bd5.pdfIn PDF document text
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/a570295f0f.pdfIn PDF document text
    • https://xuzekivaf.weebly.com/uploads/1/3/1/4/131453918/pidenonazuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fe571a4ae313.pdfIn PDF document text
    • http://helen-art.ru/the_complete_sherlock_holmes_volume_257ijd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_60450c68a4ec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_60175f7a11dda.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/plumber_2_game_walkthrough64r71.pdfIn PDF document text
    • http://klyshsheff.xyz/fumubijilucuv.pdfIn PDF document text
    • http://pipabineki.22web.org/sifugona.pdfIn PDF document text
    • http://gatorama.site/mexixevopunisnkp3l.pdfIn PDF document text
    • http://vizionsmc.net/what_diet_has_the_quickest_resultsuiflz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5fe673b975c82.pdfIn PDF document text
    • http://wowit.pro/tibialis_anterior_stretching_exercisesuf3jw.pdfIn PDF document text
    • http://yewes.fun/lorca_un_poeta_en_nueva_yorkq4vs4.pdfIn PDF document text
    • http://zagiropi.22web.org/wedepapogu.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/tisegovofu/61836348729.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/52752093220.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/muvalizagogolisozizalol.pdfIn PDF document text
    • http://najovuwovi.rf.gd/jiddu_krishnamurti_books_best.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/15882747644.pdfIn PDF document text
    • http://miwofalixi.rf.gd/pakug.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_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 5212 bytes
SHA-256: b6db0558087971138b7acc41883fa9a8a7db824a4a97a4e12b5ec5118295fad4
font_01_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 11072 bytes
SHA-256: 2087afdef28b0ec81c4ecdc4a5806058913ec832fa1ffba2d75f2fbfdb2d3522

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