Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f68e50abc1a1d2e…

MALICIOUS

PDF

75.7 KB Created: 2021-04-16 07:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0d0107a1fc7b80d7396fb5036dec0a57 SHA-1: 5a75d41b0f4bdeefb67b548e4d70bccba6d9d599 SHA-256: 5f68e50abc1a1d2e4faee97ec137a7c06202a15a47027b5b950d4228c47dbbd0
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 0.9997

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://xajibur.ru/strik?utm_term=c+reference+type PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372355/normal_605d83be85c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_602d56884aa48.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/lubokosasomosur_dodaz_wexaritevu.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/what_is_the_order_of_a_group_abstract_algebra.pdfIn PDF document text
    • https://kikosizijup.weebly.com/uploads/1/3/1/3/131379594/judiwafa_lemusuduta_lerariruvazufe_jojixo.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/0b38e3f8ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450635/normal_6044f9c55e5a8.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/ugfIFKX/we_play_tennis_in_french.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/ZgeigFS/gipaze.pdfIn PDF document text
    • https://lololitis.weebly.com/uploads/1/3/5/3/135346836/958d9486c0.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/how_to_open_microsoft_wireless_mouse_5000.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/cnhh8fC/51591460853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_604dc4042cddd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6338952b-a1bb-4482-819e-ed0fa83bbc57/33658166386.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/wallpaper_anime_laptop_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94aad41e-5663-4bfa-94aa-9b4819fb19ae/zatirage.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/59834217320.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/zonejuzunujutuxujivaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561308fd-ac89-4b83-9911-0044f89f209a/international_bpo_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b4ed84-c196-46e1-8e20-a58ff894cc77/lobopekupamenikibegu.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/suzepoxir.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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 4596 bytes
SHA-256: 9d87e5cf807bb3ba08513a9673e14064d5753df1073a42bb59b88417054525a4
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 10816 bytes
SHA-256: d9bef915f18b7e9e3cbdac1de23bf0fc5aeb070100d07709d3034575e7736080

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