Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd515aa4347d636…

MALICIOUS

PDF

73.1 KB Created: 2021-03-29 07:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13807708ada7e38f5c0bde60bb745098 SHA-1: c65895b500f9774d6bbbc79edbb90ed0579bb5c6 SHA-256: cdd515aa4347d63663484e6e25e77eb0c020398875f84b87dcd21a938be01b5f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or redirection mechanism. The PDF's structure and embedded content indicate it's designed to deceive users into visiting these external sites, likely to download further malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=cuadro+medico+asisa+granada+2020+pdf
    • https://viberizenuge.weebly.com/uploads/1/3/1/8/131857204/8bef484f6e.pdf
    • https://tazumeter.weebly.com/uploads/1/3/1/4/131438167/xufudax-fipureburasumaj.pdf
    • http://namelesssouth.xyz/bimco_shipman_2009_word_formatal9k5.pdf
    • http://mejuzuw.scienceontheweb.net/48654064149.pdf
    • http://burrrhey.tech/92423730435r07zm.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/matovuxu-nawewebakidaf.pdf
    • http://lenudes.com/tuvojilofibazugkdztv.pdf
    • https://zawevedil.weebly.com/uploads/1/3/4/0/134012704/8001788.pdf
    • http://dumubemajizukov.medianewsonline.com/colloquial_arabic.pdf
    • http://llloooodddd.space/sociedad_de_jovenes_adventistastxo8o.pdf
    • http://voztrans.ru/microsoft_word_table_of_contents_tutorialsm5r8.pdf
    • http://nutejujaxi.66ghz.com/guvevulo.pdf
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/tonafip_kurozavowopo_ribowaxel_zivolerugigigu.pdf
    • http://vejobazure.22web.org/2304038516.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jasesazolaf.myartsonline.com/what_is_red_color_personality.pdf
    • https://uploads.strikinglycdn.com/files/d1d33324-0b79-4636-8448-302a5fa58869/how_do_you_write_millions_in_standard_form.pdf
    • https://uploads.strikinglycdn.com/files/c292df9e-e4e3-49bb-b793-b3952b358a9e/tebokugak.pdf
    • https://uploads.strikinglycdn.com/files/d64cd06d-dc7c-4995-9541-d086e3680347/vortech_mp40_wet_side_replacement.pdf
    • http://lonukidoni.epizy.com/1665857032.pdf
    • http://folalolitawos.epizy.com/bonded_labour_act.pdf
    • https://uploads.strikinglycdn.com/files/9b20af1a-5a44-4f6f-8516-b40328d7dc58/how_to_find_cross_sectional_area_of_a_wire.pdf
    • http://dixadenidufudu.epizy.com/gerukowunipebad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0f.bin
4d8436dfd1059a5658da9d55049538b0f724b3817080dbcfbc23a1482f8763ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 5624 bytes
font_01_sfnt_off0000f014.bin
50a7e1ce6052a789e6ef297dad6f2a7d1632ab99e886929a711bdf54c69810c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 11636 bytes

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