Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a6a0b559ffd0ff…

MALICIOUS

PDF

74.1 KB Created: 2020-11-22 04:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cb797ad8a36e40bb288faa5345910443 SHA-1: df281ff9631edc5d905dad6cdb1d398acc45006d SHA-256: 31a6a0b559ffd0ff0148454ccd4df905907367f113d90147f5d4524668868c3e
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=closing+speech+for+tour+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fb99442e087d.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/bdf9be2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5f8aa59f4d234.pdfIn PDF document text
    • https://sowubewakojanit.weebly.com/uploads/1/3/4/3/134348505/7268d82de10b0b.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/2c4a1.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/nulirapa_mufujo_mibemamufamezet_migafomoj.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/wabunuridojoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_5fb34c9670123.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/319c11f4-6911-4f7a-8448-bc7dfd6c5c29/mavanosexeviwexegin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20a810c-ce79-4724-93ee-165089e05483/18584079887.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/new_movies_2018_hollywood_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e12819-741d-494d-aab6-8f4576ec0a91/vunosorefubezigogub.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 5300 bytes
SHA-256: 4ffe8c52f06124ba79ba8a00ccb4122a706dc12483680dfdfc4048d1fa316d81
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5112 bytes
SHA-256: 20b6cbcdbc490dbf75b5222de1baba0282a9f3f48a24e52c04c8460afd6ea192
font_02_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 2032 bytes
SHA-256: 59fbbb53b0c219108c5d952f9f15e120f4c7998529b70d622cfe4a9d27dfd089
font_03_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 10744 bytes
SHA-256: c233b6d91e521fbde20d82e55fe64076fc557f93780db2c021db9e46339f5e80

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