Malicious PDF — malware analysis report

Static analysis result for SHA-256 4267c24a35e68b78…

MALICIOUS

PDF

87.6 KB Created: 2021-05-02 13:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 671d85aa54dcc6866882ced69786f75f SHA-1: e066f94f5b457dfef8a1e9090d9f8565f20464d4 SHA-256: 4267c24a35e68b788f53afbe583201a3ae414c338b02111b209830c30fa6e75f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary malicious URL identified is https://bologen.ru/strik?utm_term=the+missionary+position+christopher+hitchens+pdf, which is likely intended to lead the user to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://bologen.ru/strik?utm_term=the+missionary+position+christopher+hitchens+pdf PDF link annotation
    • https://cdn.sqhk.co/kidatufo/dhbjhm3/game_booster_play_games_faster_smoother_apk.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/cysa_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gupukutolet/XKzD89f/cardboard_boxes_wholesale_trinidad.pdfIn PDF document text
    • http://sputnews.com/braverman_company_has_two_manufactur50rzs.pdfIn PDF document text
    • http://mnclassis.org/943186086777cs2k.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/cwlIQe8/depejigovili.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/xazasanijikubifemufelinak.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/f1nqbMH/80448331470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawavaroxu.myartsonline.com/phytophthora_colocasiae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e32869-b130-488d-8acb-b3a11f450fc2/understanding_human_sexuality_12th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/32807339441.pdfIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_c13bae97728c46a7aa2890524a70e783.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_980768d5276543498c1499acf0e6c3e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/muvutokigusunijaruxe.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/pearson_chemistry_chapter_2_assessment_answers.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_bbdcd5d0353e43cdba8411eb30aaaaf2.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/88274550432.pdfIn PDF document text
    • http://zigakakedulogim.myartsonline.com/cylindrical_capacitor.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/gasifetekoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c118655f-a902-4b2a-a0fb-66abb460e2e0/64609589002.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_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 5416 bytes
SHA-256: 73c81c32a3f890991a393c9bbe55a2522d966463787043e98ec72f0c6d3efaf8
font_01_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 11624 bytes
SHA-256: ca4c5080267ae83b2c38d6ac9605fb4277c1c53130ad73f60fa38b573c4a4e44

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