Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea3f0cb89b86627…

MALICIOUS

PDF

74.8 KB Created: 2021-06-04 02:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f59fdc10b8b37bd1f3d3a5b16daf98aa SHA-1: eeacb67ab6ea53400603c3b57667c3e805a4b674 SHA-256: cea3f0cb89b8662763d832bf7dbdaf770fc84de17ec9433a39163a57878b24e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=what+is+the+difference+between+weak+and+strong+verbs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488837/normal_60053cf53cb2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fd1266b320d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_604d2c15b0755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fef71e61a854.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_5fc71c5851888.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/1167010.pdfIn PDF document text
    • https://sutafosuteloxep.weebly.com/uploads/1/3/0/8/130814172/nukuz_pamesudun.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/8495836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_603ef3935ab07.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/a2abf26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5fd257471963d.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/d816ff69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144556320/jaxavoxuwinivokebi.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/bardo_thodol_portugus.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/letras_de_canciones_cristianas_con_acordes_para_piano.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144559797/5764665670.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/what_is_the_moral_story_of_les_miserables.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/naravusojajekaj.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144419568/how_to_connect_veryfitpro_to_watch.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144439167/56893293684.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/f/1853065145.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144520296/lixojimo.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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 5620 bytes
SHA-256: 430ab05046de1716f17a6327cb828e5931c208bad93b5f93a8c7a0c36823c24b
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 10520 bytes
SHA-256: ea60586d7604df897556ba3f183b894ac4fc0eae05dfbb33242208ce1e5c8f4c

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