Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8ba1ffaf7857a…

MALICIOUS

PDF

61.5 KB Created: 2021-02-11 14:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1702c54c9c4cca45eff50f186ee0991c SHA-1: ae30556473fc001cbd1bcb5381d5f469ae5d4f0c SHA-256: 81b8ba1ffaf7857af531cdecfe0c3dcb6ccde37f107e7b0aba61cf9dcc5e791e
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=lesson+1.6+practice+b+algebra+2+answer+key In PDF document text
    • https://salebenokinaka.weebly.com/uploads/1/3/5/9/135963362/gawadegu.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/7324726.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/50b3a09d6ce552.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/fizujo.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/fgcIjij/96213272662.pdfIn PDF document text
    • https://terabuzaxora.weebly.com/uploads/1/3/0/8/130814115/vedimaka.pdfIn PDF document text
    • http://akmurzina.com/87353664688rljba.pdfIn PDF document text
    • https://kekuxepepave.weebly.com/uploads/1/3/0/7/130739312/1049195d15cb.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/geErTgd/left_car_running_while_pumping_gas.pdfIn PDF document text
    • https://badupulok.weebly.com/uploads/1/3/4/8/134855905/wolopefaded.pdfIn PDF document text
    • https://puvedevedumu.weebly.com/uploads/1/3/1/4/131406841/dovitevanunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/26353722164.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/free_flight_simulator_for_android_tablet.pdfIn PDF document text
    • http://gujupikisikali.epizy.com/block_letter_format_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/chief_information_officer_role_and_responsibility.pdfIn PDF document text
    • http://tudibakigar.epizy.com/2745443416.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_off0000b38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 5808 bytes
SHA-256: 6209e96bd9326fb6edbe0ac8b99928ae20514cb906d228f2e578f72221677244
font_01_sfnt_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 9796 bytes
SHA-256: d9378c67f9e54e0c7b7586f8fc02c9b8a70e85983ff35d1af370cdcd4746b9da

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