Malicious PDF — malware analysis report

Static analysis result for SHA-256 885cf0a0df19a94f…

MALICIOUS

PDF

77.6 KB Created: 2021-05-31 22:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b78848722404ff8e2330943c0573f54 SHA-1: df6e9a1cae342d1ac8bc771ecab9cef4561276e2 SHA-256: 885cf0a0df19a94f1cad981ca201438a423eff4fec2998a6aab05f81624f448c
126 Risk Score

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 0.9991

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://pistant.ru/pbw?utm_term=all+benefits+of+forever+aloe+vera+gel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5ff1ff45d6d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_605aea353efa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fe805037ff46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495550/normal_5fee2f10218b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_6046aa96dec42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_605c583069543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_6035d42ecda86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_603def31a055c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_605588d22af52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5ffa06f55c242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_60288eafe66fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_6054715284fbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxikadafi.pbworks.com/f/72117651658.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/kirigami_pop-up_card_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de75a41c-163f-438e-95e4-0eb6c1efad7c/how_to_replace_a_transmission_solenoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c447b9-2926-4431-bfde-ecaed900ad7c/51759803048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513e2e87-8a44-49d1-b01e-9457f0f6c88a/95701183414.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/79535583770.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144416028/krunker_io_aimbot_free_no_download.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144418941/why_does_it_smell_like_maple_syrup.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/brush_pen_hand_lettering_worksheets.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424389/bosch_ts3000_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1657af4d-39f6-428c-bd3e-96b29e0edf2d/gabafikenibozine.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144423333/22043208785.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 5124 bytes
SHA-256: 9e2999a776ceda4a6963160d5a9bb7ccbf43c5deaf74275734134a3e81b32ef8
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 10580 bytes
SHA-256: ccfac0a0e7c1b61662a6bbbb2c74030f864384b73b1d9126cd23fa433f22579d