Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38d1232398ffd6d…

MALICIOUS

PDF

99.0 KB Created: 2021-02-25 10:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d56210771f0a4606f12b84ec1072205 SHA-1: 88cea41e87c66d3e8f0bb6c931154d009a02ccf1 SHA-256: c38d1232398ffd6db2cb5922836cb87fb9e33c36becff36a58d1418c2fa51ca2
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 0.9995

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://leonvi.ru/aws?utm_term=zane+grey+free+ebooks PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409243/normal_602cb025a9839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_5fd2881f678c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe43f2609f6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5ff71a6972c94.pdfIn PDF document text
    • http://kelijoninofi.22web.org/nidevujijalosater.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/jcjdIlD/tobijatifakumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_6022e1d417fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_6027ff45b02de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_60336a863f295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_5fc7a3b59d493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_5fd2816e1a495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5feb4f2973926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_600f1ff3c4979.pdfIn PDF document text
    • http://kirivil.iblogger.org/84219512981.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/Jhi7Izs/24269568457.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kejarajavamoge.epizy.com/anarkali_songs_kuttyweb.pdfIn PDF document text
    • http://fibilizovowudux.epizy.com/decathlon_bike_size_guide.pdfIn PDF document text
    • http://bobosuvediv.epizy.com/fscm_credit_management_reports.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011e65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E65 15408 bytes
SHA-256: 111c5d3c97e04c808b0cdd7724dea4fce097bb8dcde71e040003e20201d24a3a
font_00_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 4828 bytes
SHA-256: d2d42f1fce60308b9b427a2b6094255dcede62fe9a3cf0cf82520c3a2bfffa72
font_02_sfnt_off00014a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2A 11440 bytes
SHA-256: 4cca1a763e72d063159de77e28fcbd6470934d3cb157b3580966af762c2a9e0c
font_03_sfnt_off00017076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17076 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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