Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c9760ed44a9cec…

MALICIOUS

PDF

74.4 KB Created: 2021-02-21 03:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 531a8b774a86bf72154f8dcb9c8325c7 SHA-1: 97dd4807134c833aab78fd219f821d1acb1f6418 SHA-256: 80c9760ed44a9cec039ec35778142d7bd6d2779411c945042e5c523de4e9594e
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://druttle.ru/wix?keyword=vt+calendar+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373502/normal_6017be6fd03af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_602e29e708d27.pdfIn PDF document text
    • http://academic-club.ru/8_ball_pool_play_online_cool_math_games2uxld.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/hb6hi95/rizusoj.pdfIn PDF document text
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/7709433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483336/normal_6023e40cdfa5e.pdfIn PDF document text
    • http://noksipals.online/32706215507342nf.pdfIn PDF document text
    • https://cdn.sqhk.co/fololekumi/ZJDria0/airbnb_customer_service_number_host.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/ghJwncu/idle_games_like_realm_grinder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454965/normal_60065e7c8a8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_603187bfe8e0f.pdfIn PDF document text
    • http://prodson.space/how_to_describe_sunshinebeb0d.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/cbaD2hd/wolf_heizung_service_app.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
    • 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 4624 bytes
SHA-256: 1f9c148db184583c436627ba1bd152c3fbe2ce9eb3bded37dc8574531ca6549f
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10824 bytes
SHA-256: 0bf5adec6fac8c092b30c14a66a09fb0eb189ae7da46c0579f1a44db9bd00256
font_02_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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