Malicious PDF — malware analysis report

Static analysis result for SHA-256 360364e18934e0ab…

MALICIOUS

PDF

75.4 KB Created: 2021-03-08 21:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b634fbce81b1215400884c455a87f021 SHA-1: d8bc9ec1d396e68edc516e43e18934476b747199 SHA-256: 360364e18934e0ab8a412b89f4fc13a52062d8e1e53c9b148e9bd18a947acd46
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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://pelibifir.ru/strik?utm_term=what+is+the+domain+of+an+inverse+function PDF link annotation
    • https://lipixifafamuxa.weebly.com/uploads/1/3/0/9/130969384/gaxebamesuzil.pdfIn PDF document text
    • https://sidatotivokusud.weebly.com/uploads/1/3/5/9/135959985/wegupi_wisog_tiwisunol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fc5f5655f221.pdfIn PDF document text
    • http://cmbespaceclient.xyz/72476834608gjq3r.pdfIn PDF document text
    • https://cdn.sqhk.co/kumafipadel/FidaAFV/addition_and_subtraction_up_to_100_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/M6jebig/marimejaxoxufigiru.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/30d1525474.pdfIn PDF document text
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/397bb979e76d.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ijxBMhh/packers_game_tonight_on_tv.pdfIn PDF document text
    • http://canonsburglake.com/mikobibopevoe0l0o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_602ab4184208e.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuwimavez/WhigggU/gomedewovegozeviw.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/a439a6b2-c2ef-429b-956c-f20aa8847394/35534963653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa52f3f-dd94-43bc-a3dc-ec7f892652ff/what_reduce_the_risk_of_heart_disease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf22fc9f-fdf5-45f6-adf4-d1e2d961272f/vizio_e400i-b2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29458d4-fc88-4759-be23-8c3f27edce3c/is_cbt_effective_for_adhd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700f8505-5ae9-4ad2-8c72-ed6fe03426a1/hook_for_romeo_and_juliet_argumentative_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f5ae5c-eb16-491d-a940-45d2bdc0fba3/41605592598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5887c739-d0f7-4e59-9832-365b656704c3/logitech_mk520_wireless_keyboard_and_mouse_dell.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_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 5300 bytes
SHA-256: 3d7a0c70fdaa616f959b30b08f5279781ea7a2fe6588bef7ce4503b75e9dd004
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 11428 bytes
SHA-256: 7f4479ecf95036fc2a0f1d3ab66231715fce927b4e7838060da2bf713bb165aa

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