Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c79a46f56cb647e…

MALICIOUS

PDF

79.7 KB Created: 2021-06-10 15:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8710373d4f2a89fe681b504db12acff SHA-1: 71a79296b2bb80cc189feb06fc3ce558bfbdeac2 SHA-256: 6c79a46f56cb647e03dc0f6f7f4039cc7dc9313c4dae77f9b5358f4e6d92edba
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=autobiography+essay+example+pdf
    • https://waliruwixogipi.weebly.com/uploads/1/3/4/0/134016871/lotipatif.pdf
    • https://lapumutugafi.weebly.com/uploads/1/3/4/6/134601317/8146934.pdf
    • https://cdn-cms.f-static.net/uploads/4369150/normal_60669e63a391c.pdf
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/givelaperus_wupasokiwimivow.pdf
    • https://wabavavopip.weebly.com/uploads/1/3/4/3/134317653/fibitopitojap-xexafagune.pdf
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/rolivuvotuva.pdf
    • https://cdn-cms.f-static.net/uploads/4366660/normal_60469b45847cb.pdf
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/183eaf1.pdf
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/5499873.pdf
    • https://xisudujerixaxir.weebly.com/uploads/1/3/4/5/134583325/zawosimudelogaj.pdf
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/rikogemakiju_noximimovokar.pdf
    • https://mejuxubewa.weebly.com/uploads/1/3/4/0/134041058/8657555.pdf
    • https://cdn-cms.f-static.net/uploads/4464707/normal_60571dec48497.pdf
    • https://vibemabejux.weebly.com/uploads/1/3/4/6/134668328/gizepodosejufa_femomimis_fisugeb_baxip.pdf
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5fecbc1d00a76.pdf
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/zazadolesixafanokom.pdf
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/6839708.pdf
    • https://pigiburoletu.weebly.com/uploads/1/3/2/6/132695467/vejovutazerarujuzaf.pdf
    • https://birijoxumel.weebly.com/uploads/1/3/4/5/134587798/946759.pdf
    • https://rutisipileriruk.weebly.com/uploads/1/3/2/7/132740940/pajexakawik_verunokironol.pdf
    • https://fuloronarenor.weebly.com/uploads/1/3/4/8/134880411/9d20ba81704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/45a6bee1-5463-4084-8329-9f98daa7b45c/41659745059.pdf
    • https://uploads.strikinglycdn.com/files/76791016-23a6-4fe1-91a5-0f8ec6047671/lafibesoz.pdf
    • https://uploads.strikinglycdn.com/files/cff4eefe-f924-4c37-87b5-4097f7250dae/tefudavowaxav.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_off0000f964.bin
ab02eac3006481fee3a48afbca7428106ef75db7e17fb865e324f19a1bf822ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 5752 bytes
font_01_sfnt_off00010ce1.bin
224e46e085bc08539ced2e66fd54a509cf338b5d16c5866fdcce30b09c66ab06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 10684 bytes

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