Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c6e764d195da02…

MALICIOUS

PDF

73.0 KB Created: 2021-02-25 09:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bd113b5a5af556756b685c3c48455461 SHA-1: 2916494333d54eeb306205b0d7fa0627f5b59a18 SHA-256: 42c6e764d195da026aa31c40af3aa7625b2badfe4fb3ad22929673721f34b088
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically rather than being a legitimate document.

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://seumenha.ru/aws?utm_term=outlander+diana+gabaldon+quotes PDF link annotation
    • http://faxusupovetek.sportsontheweb.net/kitchenaid_superba_oven_door_replacement.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/bemoruburukufojag.pdfIn PDF document text
    • http://frut-tree.site/477974777641vw2g.pdfIn PDF document text
    • http://teenagetutor.net/84383462519eg1eh.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/2710953.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/why_is_it_important_to_have_clear_goals.pdfIn PDF document text
    • http://ins.expert/a_commonsense_guide_to_fastingp8q8p.pdfIn PDF document text
    • https://wibotutez.weebly.com/uploads/1/3/4/0/134012840/dumidipu-kexovan-silamuxelo.pdfIn PDF document text
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/nemimigavufikarobo.pdfIn PDF document text
    • http://boxberry-24.cc/ie-_3000-_8tc_data_sheetfmrdh.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/what_is_the_newest_ps_vita.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/dgiVgcs/zuzerutilugetuworudusun.pdfIn PDF document text
    • http://numberoone.xyz/92319184667hs7x7.pdfIn PDF document text
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/1301290.pdfIn PDF document text
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/5102554.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/sabertooth_x79_memory_compatibility.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 5288 bytes
SHA-256: 899db9f76ed035b41da8322fc0aacd2bd55169a66c772a0a447190a9467290ae
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 10576 bytes
SHA-256: 0241882fc7013bf194fb8a4519e0ee2b9e9cc92dafcc8d4e49e26f68c1cf4e20

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