Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7c0dac1808bf85…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 02:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd8ec3a1ff73e60d28f252da112b1c86 SHA-1: 718974255275818ce1fa19e26c4184e492c2321e SHA-256: 9c7c0dac1808bf8532d09a4cbf31dc615ad7c120e7954dec13ce6c45d264a4d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://dafemum.ru/wix?keyword=seiko+coutura+kinetic+perpetual+setting+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5ffe51d812266.pdfIn PDF document text
    • http://damvglaz0.xyz/do_you_capitalize_professor_emerita82v5m.pdfIn PDF document text
    • http://nadozigipak.22web.org/ms_excel_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5fe069145cfa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_600e74e4c784d.pdfIn PDF document text
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/musawolax-tavoremux-bijemopaze.pdfIn PDF document text
    • http://my-credit.info/nifurudiyyny0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_6006f922a1817.pdfIn PDF document text
    • http://shop-profildoors.ru/vakezafakorafujufaxiv52t3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_6017168681873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_6047e07e42a6b.pdfIn PDF document text
    • http://semengergel.ru/how_fast_is_the_new_mustang_mach_eygx11.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/kagufuti-sibaso-zerobanos-luloxuxadebuxo.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/1d74dc4f-1c6d-4c95-bfa8-ec5ba8465e26/na_living_clean_book.pdfIn PDF document text
    • http://soxekig.epizy.com/checklist_format_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2635a277-9b93-4095-bcbf-b980ff6f1dea/high_school_be_capitalized_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840c55c9-6c7b-47ca-8b59-050b8ee72d02/can_you_have_a_curved_line_of_best_fit.pdfIn PDF document text
    • http://vipagepegavazus.epizy.com/lazoji.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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 5268 bytes
SHA-256: c55e403b268a9eee1689ded5c7c842efbb8bd0a8c63c889c2b6484e5b4370160
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 10852 bytes
SHA-256: b7b4c30ca27d56ee79b251ffa4de13085103aeccbf9317b5b768a5af6f10f264

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