Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf79fd1599728b3…

MALICIOUS

PDF

72.7 KB Created: 2021-06-01 09:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8c385d87257bce6af67bfa68eb8d42f0 SHA-1: 59fc926ae5c7feb7b4e18b07a2ed3a01a00d6f28 SHA-256: 8bf79fd1599728b35bd077fa681ce6c993b4e4b15d65f908123efe75143ca3bb
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://nomylo.ru/pbw?utm_term=kidkraft+stonewood+outdoor+playhouse+instructions PDF link annotation
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/2474526.pdfIn PDF document text
    • https://kelukija.weebly.com/uploads/1/3/4/3/134337818/bc3a8.pdfIn PDF document text
    • https://zepekerikolex.weebly.com/uploads/1/3/4/0/134017535/pixamasuxasabi.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/8245046.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/7409359.pdfIn PDF document text
    • https://daxusakisawepan.weebly.com/uploads/1/3/4/5/134527958/wakulewe.pdfIn PDF document text
    • https://jakipafowikodo.weebly.com/uploads/1/3/1/0/131070805/xixijixixanulevek.pdfIn PDF document text
    • https://redefanugolikiz.weebly.com/uploads/1/3/5/9/135975275/mifip.pdfIn PDF document text
    • https://polafepunulud.weebly.com/uploads/1/3/4/7/134718340/97e6eb7.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/kejagugeroj-lutuwera.pdfIn PDF document text
    • https://vobokalonumenu.weebly.com/uploads/1/3/4/6/134656332/giwosow_ninoniriwi.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/922507e9987108c.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/cdc87.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/79cf1c39-0624-4e6e-b123-4bd6c6e15d93/possessive_nouns_and_possessive_adjectives_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b21ab2c-d18c-4565-86f9-dfeaffd6bc1d/what_you_need_to_know_when_buying_an_existing_business.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/linagolejebogofilotam.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/88200283472.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/what_is_molecular_bond_theory.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/babi_italia_parkland_convertible_crib_assembly_instructions.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_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 5472 bytes
SHA-256: 691c3a8184859db865a509267b34e53b8d3b016a6c869f7139fe1f22d3f64f32
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 11476 bytes
SHA-256: 6c7562c87757911be9435ec78b49ea2446105a3542cd4b08ba0f786c4fca20d9

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