Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a17da8f320ec344…

MALICIOUS

PDF

117.6 KB Created: 2021-04-16 00:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d65e47db82858cd7265c58c9e084df70 SHA-1: de61cf7b7473e0c62751f779a2bf4d3bb79877e4 SHA-256: 8a17da8f320ec3441f970b660214e6d860328764d118d3f92a8f066404096c5f
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains an image lure linking to an SEO redirector, specifically 'https://botokaw.ru/strik?utm_term=texas+reading+first+fluency'. This suggests the document is designed to trick users into visiting a malicious site, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URL redirection are strong indicators of malicious intent.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=texas+reading+first+fluency PDF link annotation
    • http://lidujer.22web.org/introduction_to_atomic_force_microscopy.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/ihpdLeT/business_board_indonesia_apk.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/75908374443.pdfIn PDF document text
    • http://tuvawom.iblogger.org/4881101253.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/canada_protection_plan_application.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenodisoda/chigeja/54082335147.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/mugipejokenalumepadafemo.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/best_video_games_to_play_with_significant_other.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopumupukerodu.epizy.com/linear_algebra_with_applications_9th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/31126380958.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/87634851301.pdfIn PDF document text
    • http://sasotogatajuxiw.rf.gd/ashes_remain_bring_me_out_lyrics.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/certificado_de_antecedentes_penales_afip.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/ford_escape_2018_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/amuseren_informeren_overtuigen_activeren.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/42880000116.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001915c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1915C 5308 bytes
SHA-256: 12536a66eacbea4e95de116f3492eafafe3fdc31f9813281bdb910bdf74d99da
font_01_sfnt_off0001a386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A386 11180 bytes
SHA-256: dac7a4c33193393220792d2a66b72fc8d56366ccf02af9f80da2bac7c9c74bf7

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