Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8067ac69532b8c3…

MALICIOUS

PDF

68.0 KB Created: 2021-04-24 07:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e6fad645d277c09647badded2940b85 SHA-1: c03b5859a186cd106701d80cf36da62224f65a26 SHA-256: f8067ac69532b8c3960e43ec4930ae8712fa953af18cfaa902721eddd390bc4c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=arabic+vocabulary+flash+cards PDF link annotation
    • http://idealicaufficiale.website/vuvaxukuvafunuwolatctjsn.pdfIn PDF document text
    • http://fevalugumaj.22web.org/vuzipipenawimupugurez.pdfIn PDF document text
    • http://cesaregaspari.com/beerappa_oggu_katha_songs_naa_songsqu3up.pdfIn PDF document text
    • http://naturaleone.space/letter_format_for_absence_from_workyoarm.pdfIn PDF document text
    • http://lidagejelotodu.22web.org/monafubazamegagipatifim.pdfIn PDF document text
    • https://penalimabupata.weebly.com/uploads/1/3/4/7/134700578/lutim.pdfIn PDF document text
    • http://wacc-cat.org/89398763598mph0z.pdfIn PDF document text
    • http://sedouche.xyz/225566370039cr3g.pdfIn PDF document text
    • http://xsafak.com/gas_absorption_in_packed_columnf4udn.pdfIn PDF document text
    • http://pokypka.xyz/cosecant_secant_cotangent_worksheetypsd7.pdfIn PDF document text
    • http://zathkatow.xyz/87642650652dfy0t.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/dakojopetovenur.pdfIn PDF document text
    • http://ellmax-site.xyz/livitomokoxakemelizo7kqvf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_a79ce794a2384465a7f59a1990183f86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/how_to_pronounce_necchi_sewing_machine.pdfIn PDF document text
    • http://dogolapobu.rf.gd/dokuxobanivevutasigebaziv.pdfIn PDF document text
    • http://wukekikisowif.epizy.com/jotedefelabudame.pdfIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_14595c39a22840de9ddc35f7ba48ec3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/tom_sawyer_jackson_island_map.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_eafffe0ffa8c4ae28800ced8d8498ac9.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_68ecc21943c04ee58959b3e9c434e424.pdf?index=trueIn 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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 5400 bytes
SHA-256: 3a137d607eff060359d369454fa2c9352de7084159561e43631cca0835962821
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 10224 bytes
SHA-256: c6f5ac7e75984bdc9648c04eed4476a38d0ce82a55ca3f000cf6702c0c7099a7

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