Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4fcff968eaa574…

MALICIOUS

PDF

72.7 KB Created: 2021-02-25 06:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 17c5616bb7f769e67cd9b2e3125945fd SHA-1: 6363a0fbce7385d331f392f36d91df79d1896c2b SHA-256: ac4fcff968eaa574fe0ba4d0551a47f3e4c168f6168273768d7fb6d629d65481
156 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 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=best+book+on+number+theory+for+beginners PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fcda63a54c51.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/5566394.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/ifnggdq/fuvirupiwavitezokikejow.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/giOlqgf/3138086668.pdfIn PDF document text
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/badedo.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/gjheKia/doomsday_on_demand_2_unlocked_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fd63a7a0d65a.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekajebema/ejjTiih/granny_simulator_multiplayer_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/BY5ieGV/roludewopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5ffb8d3c4f77e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/pilujano.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/the_myth_endless_love_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/tavizimetune.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/5079288403.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/57052649799.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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 5292 bytes
SHA-256: 1557b01d38dfdadc75e668f5f47514a67814acff5747db47831025aa7caed5ac
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 11404 bytes
SHA-256: 308d8462dc13760d7a57324230f53085c714b04573a037a9b2ab7504785b3abd

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