Malicious PDF — malware analysis report

Static analysis result for SHA-256 684b90400134f6d4…

MALICIOUS

PDF

75.4 KB Created: 2021-02-22 12:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 624edf85dbf5c7ce0e9d13928a9ffdf7 SHA-1: 69eb920715a63adb3cfbae2e1d28d98f1052e706 SHA-256: 684b90400134f6d440b83940e06a1b9f82665e6e0f07ebc9272c5bfb5c91e9f5
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/wix?keyword=treasure+hunter+guide+ff13 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453108/normal_6023ad20d2af2.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/wgcjckm/great_white_shark_hunted_by_killer_whale.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/subetomibirux.pdfIn PDF document text
    • http://civiliscmq.online/motor_learning_and_performance_5th_editionl6slv.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/yTigDUv/scary_anaconda_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/hhJm93p/celebrity_cruise_tours_alaska_2020.pdfIn PDF document text
    • http://jupowawixiz.iblogger.org/zawufokodimuwo.pdfIn PDF document text
    • http://hookup157.online/47427859795qdyhg.pdfIn PDF document text
    • http://lemoxovuv.22web.org/20441508358.pdfIn PDF document text
    • http://wavarev.22web.org/35910266826.pdfIn PDF document text
    • http://uaregroup.com/51827853498n3dvl.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/YhaibVq/48639185340.pdfIn PDF document text
    • http://pogofefopi.22web.org/91719882772.pdfIn PDF document text
    • http://usene.xyz/883394294288jkv7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fe3a18f098df.pdfIn PDF document text
    • http://fb-ig-copyright.com/fodemube2cyyd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonuwufif.epizy.com/free_tv_guide_regional_wa.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_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 5300 bytes
SHA-256: 2b79b28a4d607f47a39d7038bff9e1dd63585263e7555b587f28b22b01fd6bb1
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 14156 bytes
SHA-256: 068de346684a398ad0ff95578f3cdbfc088dd11144a07c7c441c179487f76075

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