Malicious PDF — malware analysis report

Static analysis result for SHA-256 41703dc7cb5dfbb8…

MALICIOUS

PDF

68.8 KB Created: 2020-11-18 22:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d5d20270f684a5d91fc952cd2ea4e89 SHA-1: 20177d638eeb0515f51ac02e48790eb2789e719c SHA-256: 41703dc7cb5dfbb8c1e272ff87cd3be5a00b9f5b29d06d52e63447fc3f4ddb62
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffe.ru/strik?utm_term=past+progressive+exercises PDF link annotation
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/konozebax-tofivox-ragowida.pdfIn PDF document text
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/9612027.pdfIn PDF document text
    • https://joxinisedubetif.weebly.com/uploads/1/3/4/5/134594754/6877391.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/8807182.pdfIn PDF document text
    • https://mogawurid.weebly.com/uploads/1/3/4/0/134042680/wubanogapatobil_menugonizulaguz.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/f1f16054c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_5fa9069b9af96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f8cb431bed5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f969e08ad514.pdfIn 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
    • https://uploads.strikinglycdn.com/files/d7fc1c7f-907b-41fd-b6a5-5b505fd61a0a/dafol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f743eaf2-8df1-4cfe-8cac-babd89cbac8f/73739739306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d48927-e7b2-4eaf-9090-657a1ff670bd/gogudim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998e50f1-9e0e-4fcf-8120-f4f6ceafcee1/free_minecraft_accounts_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a429ec-965c-437c-988f-779067ae88f5/helium_exit_bag_success_rate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33dc239-b247-4921-8bea-2c5b10f6381d/books_of_the_bible_list_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6634dd-6c91-489d-a5ce-5d302e88724f/dragon_ball_legends_apk_download_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC240 4880 bytes
SHA-256: cdc3cdb91e6d4c3622297c1b5595e2ac432919df9d2a972d9db8ce2ba5d75c23
font_01_sfnt_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 10488 bytes
SHA-256: 06b06491a67f85a5477d1c27517ab4cfc92adf29574a65a6e6e29adaf8376787
font_02_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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