Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f923726677200fb…

MALICIOUS

PDF

74.8 KB Created: 2021-04-12 17:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc5460c752289b37ace28d5c6794f2b0 SHA-1: 9565e38da319e42ec5a75a6b676041fd7cfb8914 SHA-256: 0f923726677200fb2813bd25a1fa38db20b5789eb79eee4accf0abb945b02e20
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 0.9997

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://golowaki.ru/strik?utm_term=how+to+calculate+flow+rate+of+gear+pump PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386336/normal_606d9a53f3eaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/jhigerz/flying_jatt_mask_photo_editor_online.pdfIn PDF document text
    • http://cethq.xyz/mugevanunitig4iccu.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/f2jbujd/club_dream_miami_closed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff1b25c26216.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/26547672939.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/9fnOdEm/ftdi_driver_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/jj5FjjW/23531037082.pdfIn PDF document text
    • http://kyhni.site/8_pointed_origami_transforming_staresjwp.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/iclhig0/chocolate_covered_strawberries_and_nuts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_5fe66947923b5.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/WWjghfe/70652981984.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/Zigjdjb/buy_bitcoin_botswana.pdfIn PDF document text
    • http://setopin.mypressonline.com/robegimisiredobunu.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/hgjcogg/ice_cream_rolls_fort_lee_nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_60613cea2041e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_601074ad5c376.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ejihbRo/71609690925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_5fe98ea819f94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kitilogokufalu.atwebpages.com/rofumaxuwefatagegag.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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 5208 bytes
SHA-256: b6cbe252f19eda0356287d6b3c78a18b1546ac9ff669d456ca968fb30af9ffdc
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10444 bytes
SHA-256: 1283417b4bca27a4744ade5dc5d3528a03fb55fdfe68959ff421cbec5161ffdc

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