Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe57a03f519a2fa4…

MALICIOUS

PDF

71.8 KB Created: 2021-02-24 06:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9a900ff6e11c1647080b93090edf8658 SHA-1: 9347a8df76e17733187c14f3068aa4ee048a2159 SHA-256: fe57a03f519a2fa4353588eb1328c2d95423998b7fd1bd14ed83203177191701
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of a URL with a 'utm_term' parameter also hints at potential phishing or malicious redirection. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=oa+90+day+recipes PDF link annotation
    • https://cdn.sqhk.co/gujowaxexag/hbghgjc/3048645893.pdfIn PDF document text
    • http://vujakaz.iblogger.org/how_to_make_origami_out_of_construction_paper.pdfIn PDF document text
    • http://politach.com/hotsy_pressure_washer_parts_manual18nh6.pdfIn PDF document text
    • http://demask.space/samsung_a800f_frp_reset_filed1y3y.pdfIn PDF document text
    • http://all-system7.xyz/45546697685hh58z.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/S8V5PaJ/beat_mp3_2._0_rhythm_game.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/pijodalax.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/5oRDOh8/xakojidasekej.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/xusozonigew.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/f7Xhjje/vejazadulonujipulo.pdfIn PDF document text
    • https://bulamudaxila.weebly.com/uploads/1/3/4/9/134903330/032fcac0bdae.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/5650510.pdfIn PDF document text
    • http://trastqort.online/ashrae_handbook_freeavxap.pdfIn PDF document text
    • http://talakam.space/domovuaace.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magivaxinel.rf.gd/35517614561.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/manual_de_ciatica_sos.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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 5460 bytes
SHA-256: 90644424b5f8341bc0520d5c1f0919849d5868f33493c098d373715fde4301bc
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10272 bytes
SHA-256: 91b3768747b157b069e811784bec7954c74ae2c4b3b2dbf1ed373a1ac6d4538a

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