Malicious PDF — malware analysis report

Static analysis result for SHA-256 a094a24a11d3f5da…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 20:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 224baf58479ca82e642c451de55f6df9 SHA-1: a822bb6f68c03301274024ecc56ae99057792752 SHA-256: a094a24a11d3f5daacdb174c052660d4da8ec940cc29fe3a07ebe0a328e53536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it is part of a PDF link farm. The document body, though heavily obfuscated, contains text related to 'types of genetic variation pdf', which aligns with the external URLs found. These URLs likely serve as lures to redirect the user to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://nipisod.ru/award?keyword=types+of+genetic+variation+pdf PDF link annotation
    • http://botefedej.sportsontheweb.net/types_of_agglutination_tests.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hguwv7D/strategic_brand_management_global_edition_ebook.pdfIn PDF document text
    • https://juxewuvolexi.weebly.com/uploads/1/3/4/1/134109000/ninibifozilaf-sulalizagulij-bemagab.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/pumikeze.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/d955b803f9cd897.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/83517051548.pdfIn PDF document text
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/xowopipepiz_xipaxazipijow_zalupa.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/geiijdo/pesipidofo.pdfIn PDF document text
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/xisekerizoni-napibukipi-benul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nudoritane.atwebpages.com/the_seven_principles_of_the_happiness_advantage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af72c12-0e45-4b7d-9bcd-6023df75197f/6219742992.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/39231492097.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/juvurolumike.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/eighth_grade_math_minutes_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d5f837-d088-436d-975e-5dd779d40799/kay_arthur_precepts_bible_study.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/stay_focused_app_block_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/ok_in_korean_informal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8067a05-364c-4137-b517-b7e72ecdfa7a/what_is_business_analytics_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9beae684-79a6-45c5-a131-c4248ef89927/jusejejikefik.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/lost_girl_season_2_watch_online_free.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/black_labour_white_wealth_download.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_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 5404 bytes
SHA-256: 10bfe19359424b3b648b12aa6e9e66dfef4e792922e5eae04d52df793590a609
font_01_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 10796 bytes
SHA-256: 285b193e84b2d0185ccb101402da179f900eb743e976796290d97f1dced3719d

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