Malicious PDF — malware analysis report

Static analysis result for SHA-256 4683a78e72d9174f…

MALICIOUS

PDF

72.2 KB Created: 2021-06-15 12:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd3e1d98cba8ffe293c08202e91fa5a9 SHA-1: 22b4a19f50c34a8f254b09a4e9a98cb43a9c1d4b SHA-256: 4683a78e72d9174f4d1b3294ad5dc03e48cf0c6820bb46339b328759e07b8b15
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+are+the+prime+factorization+of+50 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365638/normal_602dd579e6535.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/jokiwixirebavo.pdfIn PDF document text
    • https://sutujiwujuso.weebly.com/uploads/1/3/5/3/135390810/tenipikukeg_nuribatarepa_vikome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_6022eacfc8035.pdfIn PDF document text
    • https://visizejafu.weebly.com/uploads/1/3/6/0/136093068/balun.pdfIn PDF document text
    • https://bezujopejot.weebly.com/uploads/1/3/1/6/131606295/lelepilerole-sanevesufuvif-zusitugogojover.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/lewupipobob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_60009f7f5d93d.pdfIn PDF document text
    • https://munuradon.weebly.com/uploads/1/3/1/8/131859370/bupunumuma.pdfIn PDF document text
    • https://pavejomesof.weebly.com/uploads/1/3/4/3/134310872/vosoraxemufenin-piwesupof-gorewiw-kifebazej.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/6144351.pdfIn PDF document text
    • https://gapemudumowew.weebly.com/uploads/1/3/1/4/131437765/5099221.pdfIn PDF document text
    • https://fizalexajoridul.weebly.com/uploads/1/3/4/6/134662396/fukuwebawijape.pdfIn PDF document text
    • https://sosuwijanifoval.weebly.com/uploads/1/3/4/5/134515130/xefibejozutar.pdfIn PDF document text
    • https://xavitutasufeja.weebly.com/uploads/1/3/4/6/134669981/zupesanumelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144941475/60617060277.pdfIn PDF document text
    • http://neruwuk.pbworks.com/w/file/fetch/144642354/brain_teasers_with_answers.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144660876/gowidoj.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 5376 bytes
SHA-256: 9befecbf43251c0d9eb6747d78f4cddfea9c449df1525db5b8683cd9e1aee1c4
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10688 bytes
SHA-256: cdbab3d4832c677d594f4d61a956f96ac1fc91417bf97e577ddd0819c9cd2687

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