Malicious PDF — malware analysis report

Static analysis result for SHA-256 443d517fcaf54414…

MALICIOUS

PDF

86.6 KB Created: 2021-04-01 10:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 95efb95cbd6c968f64d386cf98faed6a SHA-1: 938facc77a1c322df89fd4ccd17a9fe352cfaa07 SHA-256: 443d517fcaf54414dc0c5a91a4c9fd38c5a85e1da53f17a6af4516b9980b599f
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://vilenefex.ru/award?keyword=aislamiento+de+enterobacterias+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc9ec92ee17a.pdfIn PDF document text
    • http://medolufinumul.sportsontheweb.net/ronegotetinuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_6042ce48d6472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_600bc89e77b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_60487e11119b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_6060a3773727c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376852/normal_5ffa268576dec.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/danarisim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5fea4346dc4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_603bdae070417.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/assurance_wireless_application_michigan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6021e84181987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5fdec9114f6e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_6018bf8aad866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6015c5a20d5a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/how_to_open_downloaded_in_kindle_app.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/how_to_fill_out_direct_deposit_form_for_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2669121b-1062-41fe-886d-c130177d18fb/honda_hs928_snowblower_service_manual.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/learn_arabic_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfbb73e-9c84-4dd7-879f-7d3ce361aa01/kodak_esp_office_2150_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/zoxedetobedepetevetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbda5f8-f72f-4235-bcd6-bc3f78e7fa35/54910744785.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

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_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 5432 bytes
SHA-256: 8895de3c17925e6b9ebe866b8f28c476b4ca690faba1c858ec9d2cf8618331ea
font_01_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 12632 bytes
SHA-256: 1e45ddfb4144ecfa01d252ff8b57413cf4989332f519e0fde92957194dd34e52

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