Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c8086576d070d4…

MALICIOUS

PDF

76.4 KB Created: 2021-04-14 22:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efc6d20d8678041db3d431361090f274 SHA-1: b61297a0a419d4708414d4dcb99a8f4a70a47885 SHA-256: 24c8086576d070d4c659c032a07820b3c374bb69d2822a4b9cd593e8e2c6c5f6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lozipotod.ru/strik?utm_term=asus+z77+extreme4+drivers PDF link annotation
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/80404604045.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/f9ihgfK/fujeguvexusevefijoza.pdfIn PDF document text
    • http://italonewsero.site/technivorm_moccamaster_kbg_select_reviewbtvw8.pdfIn PDF document text
    • https://cdn.sqhk.co/kajojetugap/hdSJgYz/british_airways_information_baggage_essentials.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5ffb83850160b.pdfIn PDF document text
    • http://fasad-dom.site/zodovuvitesazodetvlpcg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_6065388327e4a.pdfIn PDF document text
    • http://coolmag.biz/38825149337gx09l.pdfIn PDF document text
    • http://firstreadersclub.com/soul_songs_freeev72q.pdfIn PDF document text
    • http://yatvoyya.fun/eclipse_luna_linux_64_bit0887r.pdfIn PDF document text
    • http://free-at.pro/what_is_also_called_the_age_of_reason_crosswordrq7iu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomurobutu.epizy.com/computer_crime_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e29ffd-bc9b-456c-99bd-8be03a0ebed1/frindle_book_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554458c7-2374-4f5a-bed7-4cad3d465590/what_books_to_read_to_newborns.pdfIn PDF document text
    • http://rusevajubaje.epizy.com/49603647273.pdfIn PDF document text
    • http://sedilar.rf.gd/3490667778.pdfIn PDF document text
    • http://dipibezepipes.rf.gd/what_size_battery_does_weight_watchers_scale_take.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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 5064 bytes
SHA-256: 27fa6d7d2b9855350b7024383464143754ffabd8a726409b6e92608725da0b72
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 11948 bytes
SHA-256: 45c4d853163a3ff4ecd16386d03cf69818957bc2d1a37071ea856a6c53f34759

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