Malicious PDF — malware analysis report

Static analysis result for SHA-256 d446db729afd87bf…

MALICIOUS

PDF

70.0 KB Created: 2020-12-13 19:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c822c531ac0abc1b537a5c79b3c69726 SHA-1: 925efdf7e192203aa39b830372b69635713ed4de SHA-256: d446db729afd87bf23a3e1c4f26293ef61afa628491443cb16b5045c415a5896
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-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.
  • 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://trafficel.ru/123?utm_term=swingline+staplers+troubleshooting PDF link annotation
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/1c95bf12f8.pdfIn PDF document text
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/1242669.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/taguxif/klb_biology_book_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/80425997436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f322721-63e5-4d0b-8b41-601bbfd23610/rayman_origins_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/gufere.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6728f88c99b6d37cd6d35/t/5fce54538a55f2188ba82127/1607357524016/last_minute_hotel_deals_nyc_times_square.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d774ed-4ec5-4f27-89ae-e124bfb13176/dragonborn_monk_names.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/69125273211.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/tofis.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/tukap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65600f9866f3fd2f8cf86/t/5fc9505fb1f6a363c51da6a5/1607028831697/one_punch_man_season_2_cast_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05535da0-c343-451f-901e-6c466cc2fcab/24786239420.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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 5416 bytes
SHA-256: 84109c1da0825c32a8f51a026a2c6e7699bf6b0446e51edb52f0fc624ad28533
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 10332 bytes
SHA-256: 0d7b12604a74a414865499a74d694909d93a44c981e0e60cc19b8055b6351822

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