Malicious PDF — malware analysis report

Static analysis result for SHA-256 babac1914c969f4c…

MALICIOUS

PDF

80.9 KB Created: 2021-06-05 09:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e1fa3bd953894fd924b66d90512758d9 SHA-1: 114c5e3ac28dc008c21fe01c8e57eaf0adbba7e3 SHA-256: babac1914c969f4c414f93542e3aad75b4df813bbcc119020829249cb202d9fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, directing users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary IOC is the URL `https://zajinet.ru/123?utm_term=bsc+computer+science+projects+topics+pdf`, which is presented as a search result for academic topics to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=bsc+computer+science+projects+topics+pdf PDF link annotation
    • https://wogaxuporig.weebly.com/uploads/1/3/4/4/134443700/6038316.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/8325433.pdfIn PDF document text
    • https://nisewoji.weebly.com/uploads/1/3/4/2/134266574/1544283.pdfIn PDF document text
    • https://lokurosafo.weebly.com/uploads/1/3/4/4/134479987/wegevegapokelibi.pdfIn PDF document text
    • https://xumulevaz.weebly.com/uploads/1/3/5/3/135348617/momiveru_zegukovafesog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujolajoxek.pbworks.com/f/mubesevarikojudixo.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/w/file/fetch/144425433/hotel_housekeeping_checklist_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9c1ada-482b-4b6c-bbc3-9b031d09945b/warhammer_40_000_core_rulebook.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/zivibulosifinodukife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1beaa6-9a60-4db6-96df-7d4de7bb16ec/how_to_cancel_my_wall_street_journal_subscription.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/cache_creek_bus_schedule_sacramento.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144557715/99992027492.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144462651/lusaratagolotadotog.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144571206/delopurevikagaguxexup.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/52294456850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df7479b1-bf5e-4a05-a951-ed747d539eaa/gapusolivotejaganukojeriz.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144493713/90498378873.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/serway_college_physics_11th_edition_solutions.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144442233/46821959217.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/active_and_passive_voice_worksheet_for_grade_7_with_answers.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144585450/nightmare_hunt_destiny_2_master.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_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 5184 bytes
SHA-256: b1968de0ad9b871b2dfaea1bd957bd13c9cb2089676b4cc0f2ef664adba2e30e
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 11104 bytes
SHA-256: 5d1adf8d2b83a059290fc3b1b9609c718621bb60e7619b16968af871c9b8bfb5

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