Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c7a583084ad8e5…

MALICIOUS

PDF

78.7 KB Created: 2021-03-06 14:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3d67538833e623949d9018d79d9068b5 SHA-1: 5810d0b686cd252d1ed404521a260e6e6989f360 SHA-256: 91c7a583084ad8e53f56a9ca177ba6f181012246a325a0bb67fbe2161bf4c8d8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body, though corrupted, contains text related to a book summary, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=i+am+the+messenger+book+summary In PDF document text
    • https://cdn.sqhk.co/kujaruwajovi/Nha2Oih/homemade_raspberry_jam_no_pectin.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/hdlhiRa/skull_go_launcher_theme_apk.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/boxorowome.pdfIn PDF document text
    • http://soldatskaya6.ru/facebook_logo_whiteaokjj.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/mesibakafovat.pdfIn PDF document text
    • http://ig-soft-team.com/accident_reporting_in_care_homesie9p0.pdfIn PDF document text
    • https://fudiditinip.weebly.com/uploads/1/3/1/4/131453724/xawojejavavagasow.pdfIn PDF document text
    • http://excellent-spb.ru/in_an_electrochemical_cell_oxidation_occurs_at_theijzfq.pdfIn PDF document text
    • https://jukusixod.weebly.com/uploads/1/3/1/4/131483076/pujerutoposasevi.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/9766295.pdfIn PDF document text
    • http://indital.fun/date_stamp_font_dafont4vwes.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/9810867.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/tofarerujiwurilu.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/nakevoja/guide_akali_s9_top.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/voditosekuwikaturu.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/angry_birds_star_wars_game.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_c8b4c7cd1a2b41a8a95461109921c19f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/52735033116.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_c5b931b6d1fb42c3ac2a250bfeb6f707.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_9ce1cdc61d304cecb5ca9776a330313a.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_db56b7ac9d014651993bbcf38b2610e4.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_60f6946f2e994aa2b7425ba0f402122d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/janapada_kannada_movie_songs_free.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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 5308 bytes
SHA-256: c3a86855ceda153ee7574bee52e9811f89f0c3a4b8ecf8d170f8dca1164af607
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 11036 bytes
SHA-256: 00ca6afb9c1f71daa4406dfc93bdd70e22eaf197cfb9c43d66f8aa5d121e6dd8

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