Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73a603559702c95…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 13:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 514c4efef9e060d5a8604efbf5d5b2a9 SHA-1: a448bc8f2ed692c991c86fac88d9bd3a87fc7866 SHA-256: b73a603559702c95c2bd212e07af1ca044dc06b28047730aedcb52de66026731
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=past+tense+spanish+sentences PDF link annotation
    • http://save50it.pro/52724784743hpzkh.pdfIn PDF document text
    • http://rozefuzapotor.iblogger.org/rawanede.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/38430702003.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/mefiwa.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/basic_afrikaans_words_and_phrases.pdfIn PDF document text
    • http://ses-paypal.com/pipe_bending_machineas7ft.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/acids_bases_and_salts_ncert.pdfIn PDF document text
    • http://misudijawalezom.22web.org/egor_zamula_scouting_report.pdfIn PDF document text
    • http://kinorio5.xyz/91978373611z1lvx.pdfIn PDF document text
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/jukifanetar_zanafalolisos_jujuriteg.pdfIn PDF document text
    • http://indir-kazan.com/jimogekabogc2xq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_584024d8ee264ab988a997beec7ac646.pdf?index=trueIn PDF document text
    • http://fonimegalidoxu.epizy.com/regulatory_toxicology_and_pharmacology_guide_for_authors.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_d24c67ade50b4c8988a7fab0d2f4af2c.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_3292c91122b945aaadc0c3a55c53204c.pdf?index=trueIn PDF document text
    • http://fusuxitizubuka.epizy.com/79632917679.pdfIn PDF document text
    • http://wokidomogu.onlinewebshop.net/81562215551.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/janigisevavufeliveve.pdfIn PDF document text
    • http://pasadoru.epizy.com/34813437244.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_0359611a387c4d6ebbf3dc80a643418a.pdf?index=trueIn 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_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 4892 bytes
SHA-256: e47b9135566c247a8d95c8d564805c69f14cf9114763cdfca8419f436a585cd9
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 11972 bytes
SHA-256: dd242ee6175cf99c892dca8c5faded117c86421d3771d7810ee34d22b9429a7e

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