Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4350a9faf847f84…

MALICIOUS

PDF

99.8 KB Created: 2021-03-22 12:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6aab1062018025d91f61cce769d38a32 SHA-1: 308144540d28906a6bc02c64c9a086afab49b67b SHA-256: c4350a9faf847f84998470b21e33d1329a1c1c5d90f8ea1f966fed3a62436b56
186 Risk Score

Malware Insights

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

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 0.9986

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
  • 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.
  • 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://xezojetit.ru/strik?utm_term=couples+communication+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/dimasemi/gjchhxW/xiwuxumomusuroxijune.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/cannibale_didier_daeninckx.pdfIn PDF document text
    • https://cdn.sqhk.co/fivobebetax/hctjcja/busy_busy_song_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/ihgXicm/real_casino_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/jxDflOm/calendar_august_2020_editable.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/how_long_do_you_cook_oxtails_in_an_electric_pressure_cooker.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/symphonie_fantastique_5th_movement_analysis.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/12937757459.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/jibgihi/64666296135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_6057e8008b23e.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/RjjhjH0/download_for_pc_windows_10_games.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/zanoviledorota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_602908173f040.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/hjVvyih/dune_2020_trailer_release.pdfIn PDF document text
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/9522353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_6019cb8f5bc42.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/hfXabkv/neketujenok.pdfIn PDF document text
    • https://jewizebalize.weebly.com/uploads/1/3/4/6/134618682/nagokowunipoti-daresimej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_600f9b373d6ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_60563c13c69e1.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/lFlvidH/20093201333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pasulupumorowim.myartsonline.com/animal_attitude_scale.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 3064 bytes
SHA-256: 9d2d2c82f2bb2f9ef8b6f11fc1e657c0286adcd9f83ecd5893ea16642b73b864
font_01_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 5456 bytes
SHA-256: 4917a25466a1d49db5d81bd3aa8bc622e9c1f65e1c932a6bf3c31ad48d2fd64c
font_02_sfnt_off0001428c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428C 1948 bytes
SHA-256: 0eeb721455c430f3aabb7da0ff2e8a16cd79eadd93400b0ae15847ac0d45454d
font_03_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 11464 bytes
SHA-256: 85255edec1a5c36b4395404eedf65809f70e7de171c3caeaee86ffab1ec507f0
font_04_sfnt_off000172a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f