Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd50bcf71c7e420…

MALICIOUS

PDF

70.1 KB Created: 2021-02-26 22:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d06a52fcbd94146993879f79214979be SHA-1: 9ca5c6f1450928f88772a33b49b51c84428cd6ca SHA-256: 1cd50bcf71c7e420a6420cbc6400721c16095b923898f6d2928fdc76f1ed3079
126 Risk Score

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://midufefew.ru/123?utm_term=la+biblia+serie+capitulo+7 PDF link annotation
    • http://nebofimanigi.sportsontheweb.net/garmin_nuvi_3597_price.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/instructions_for_a_clear_blue_pregnancy_testyxdjc.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/3jKt8sW/neon_jumpsuits_with_sleeves.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/whijeNJ/adidas_yeezy_700_v3_alvah.pdfIn PDF document text
    • https://cdn.sqhk.co/menidume/DNhfi5K/19467864175.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/ijiazQM/budol.pdfIn PDF document text
    • http://kieverts.xyz/99167474661768ik.pdfIn PDF document text
    • http://raftgjgr.space/485211308804ko45.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/jowulatawi.pdfIn PDF document text
    • http://dreabling.online/ultimate_fishing_simulator_guide_android76ii8.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/gapedetalazewuwadexuk.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/dr2I3qz/talking_tom_jetski_2_download_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxamudixilado.rf.gd/geometric_mean_maze_worksheet.pdfIn PDF document text
    • http://dawivek.rf.gd/799817865.pdfIn PDF document text
    • http://xenegivijofawok.rf.gd/emc_powermax_2000_price.pdfIn PDF document text
    • http://dukojalili.rf.gd/are_audio_technica_good_for_gaming.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/cute_baby_image_hd_wallpaper.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/21422429668.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/alpo_prime_cuts_feeding_guide.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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 5088 bytes
SHA-256: 0b2f4f780e9444e17f00db56076fb5b447122e6b95c2c3f786be364f47a60fa0
font_01_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 11636 bytes
SHA-256: e0d332dff137302426f5f09afd01aceda56f160811187fa517afa9c119a5ba97

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