Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fbf91c2a7b2fce…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 19:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 94d4ce2c283639207108a0d61d00cb85 SHA-1: b77a7594ba0c885bec2154200780550d491b15a4 SHA-256: 64fbf91c2a7b2fceb749333bebd643e4bbcdac6f9d037b888ef73ff5529da344
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://golowaki.ru/strik?utm_term=todos+los+tipos+de+comunicaciones+que+existen PDF link annotation
    • http://sijubuwejipamun.mywebcommunity.org/kewexotetiji.pdfIn PDF document text
    • http://flathead.us/vowesiwakubenaraps4bk3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_601db70eb6a33.pdfIn PDF document text
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/ritelugotudagakixi.pdfIn PDF document text
    • http://setofexperience.site/analisis_numerico_burden_8_edicion424pv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_600ca86bf2f4e.pdfIn PDF document text
    • http://japadalifu.22web.org/zuxonobupodutebebepos.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/refidiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_6054b0ee73eb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fe5d16de630a.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/visavisojukun.pdfIn PDF document text
    • http://kewokuxumuzig.medianewsonline.com/asturias_guitar_score.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/76287469810.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/b694a2a2-44dd-4902-8ee2-fa239bc86ce6/motikipalogemedijipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befd9307-196a-4b19-8f7b-b57db75493fd/what_costs_should_be_capitalized_when_purchasing_land.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c15404-166a-4106-b99f-9edd3122351b/31897980994.pdfIn PDF document text
    • http://megugasawixige.onlinewebshop.net/azores_travel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6ae947-6985-4301-bdb9-b65bbe9a79a3/44559799004.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/differentiation_rules_for_algebraic_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5f0f0c-ca32-456d-a76c-3ae19d8406e5/fixed_variable_mixed_costs_examples.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_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 5264 bytes
SHA-256: e9145a44082d511bcf538909173e1c11d2aa6afd54f3eec9824601b1e2e909f3
font_01_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 12028 bytes
SHA-256: 6a2424c88e355e0eceb9b1bc9aa5747ffc861e3f9e55f1ed5249461ffc883af1

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