Malicious PDF — malware analysis report

Static analysis result for SHA-256 db77e676b5f1ff4f…

MALICIOUS

PDF

66.8 KB Created: 2020-11-13 06:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 085337c0d922956fbb00d74b13a46385 SHA-1: 9676c243e5383d608f249a757fad5dd5edd955d5 SHA-256: db77e676b5f1ff4f8b0d73e579e173487b10449b4dfb470f9f4794c20bcb908f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=carrying+capacity+graph+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5fa05d4fa6941.pdfIn PDF document text
    • https://tipepopodotojo.weebly.com/uploads/1/3/4/6/134636352/wuvamudi.pdfIn PDF document text
    • https://gotumofavi.weebly.com/uploads/1/3/4/6/134602885/pekifaloxezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5f944a8c429fe.pdfIn PDF document text
    • https://lixobanifalito.weebly.com/uploads/1/3/4/4/134443724/lusatasasaboket_repiro_fegutobuv_tifemawilip.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/97c11073a5f.pdfIn PDF document text
    • https://kupejofep.weebly.com/uploads/1/3/4/5/134589233/pikavadafadisa.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/537551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5f9b6bbc85841.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/162cff4a-c164-41cf-969a-28fef46b2d0a/39489190977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90cef7b9-73ce-4392-ba67-e8ddb07314fb/nimowidedimoriwosuzunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bbac763-e9b4-440b-a4dc-1bb6579e57a3/case_study_cover_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d41bc6f6-4c5c-48f0-85bf-b5ea422f26e1/34459893585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e186171e-1c76-4222-9bdd-a6b578c7dcd9/sigebubigixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9819da-286d-43ba-98e8-2fa066ffaade/57854071716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563a2d78-e1e1-46e0-9ab3-102d8d8852d7/piwowawuwe.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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 5324 bytes
SHA-256: da7278ccc3e9ffc663d37cf96b38c2b3b630bb87ae9e0d33121fb0c45f61f7ef
font_01_sfnt_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 10764 bytes
SHA-256: ad75dfc363083acbb8c09e6506aa62303c0961ffb59aa7fef81e31be3d606c64

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