Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0100645c16ba9e0…

MALICIOUS

PDF

76.5 KB Created: 2021-06-01 16:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b606b88af37498c71d25c08ba59d1d61 SHA-1: 7fa1d683e75285baca54314d5b661bf978cf3881 SHA-256: c0100645c16ba9e0cd814657e31463c035f11018cd7e63cfed90f5d211f989e9
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 0.9996

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://xezojetit.ru/123?utm_term=antiheroes+libro+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444623/normal_6000f677dc15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_6028f777ac501.pdfIn PDF document text
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/tobedoxosok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6051105c7bd8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482191/normal_5fed64184aefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5fe75599b8702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_602ca0bdaa1b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5febbf3d52655.pdfIn PDF document text
    • https://xinozujo.weebly.com/uploads/1/3/0/8/130874257/xafupufesikimot.pdfIn PDF document text
    • https://besukefovubon.weebly.com/uploads/1/3/3/9/133997228/3743613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5fd137e345c0b.pdfIn PDF document text
    • https://wobajaxeme.weebly.com/uploads/1/3/4/3/134350369/wowax-golife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fe6cf4f8301b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_6038540416244.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/d2cfa66a-1c4f-4b46-9e09-d5aeeaa128df/how_to_setup_a_hp_envy_4500_wireless_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004fa311-8281-49b3-af91-39c3504032cc/medical-surgical_nursing_assessment_and_management_of_clinical_problems_10th_ed.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/zopesovakubemavefa.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/4126878863.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/fatovuwelusa.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/f/why_is_my_maytag_dishwasher_not_draining.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423120/91917937450.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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 5048 bytes
SHA-256: d6fda5e8b6f99a39839ff439d6ad4e4caafda07cac1fae23b96d99563cb798e3
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 12276 bytes
SHA-256: 272e0da218929fb56058ca388e10e74323061e4453e36f207eb05eb0f6d3b6c7

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