Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b46679db41fb892…

MALICIOUS

PDF

84.0 KB Created: 2021-03-10 14:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5980ebae40dd52061501a7afca4d42f2 SHA-1: 52c1a8ddb2e97d5555dfc390169c3ee563489e9b SHA-256: 6b46679db41fb892d623f08178dededa8d8883528f6be7caf7f9b0689767ac91
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 0.9996

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://maypoin.ru/wix?keyword=jailbreak+ios+8.4+1+cydia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60358a8da026c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fd0655082b08.pdfIn PDF document text
    • http://trendmobile.ru/report_on_independence_day_celebration_in_delhixyvvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60279b6f9647d.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/cover_letter_for_internship_application.pdfIn PDF document text
    • http://energierecrute-emplois.com/gomoropkraqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_602b383f23262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_601e749842e16.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/fujujozulifupuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5fefdfd23fc09.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/c4cfc380-6eb8-4e24-a326-98c567ecc5a3/43028527127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452a93fd-9035-45a6-849b-ec0180fb7727/zeruwaleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d511f7d8-2cb8-4ae7-8fa6-7b78527d4a7c/4653662067.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/347205031.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/57976397466.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/76693781509.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/33870127448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba59e38-8912-4827-8d7a-0559745103b2/stihl_long_reach_petrol_hedge_trimmer_ebay.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/61273289496.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/40636098569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104d9887-1192-4be4-a664-d709ac0108c7/sorevenaxawogi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000125e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x125E1 18384 bytes
SHA-256: b47737942dd3edd7fb29dbe7ad2c447d1cb4bb83d808128e400acf03d2b01380
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 5592 bytes
SHA-256: 8856d131a067eec91f87ef794a4dac41cce743c47dae7d3870c3f14d60d2ab6f
font_01_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 10384 bytes
SHA-256: 5a57c7d254cb99dc5eda3c36985a250d8fe9867efe46463e0f37973e2226e596

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