Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3f7239e818a348…

MALICIOUS

PDF

75.6 KB Created: 2021-02-16 16:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 70e9dc51f1a37a90dd0642926ce44296 SHA-1: 5460ef7be67fd940b29b64ce64e45b5d435d0f85 SHA-256: 8a3f7239e818a3489cb4b31baa53ffa2ae73de4a288dd8dcb622b98549e7f16f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'cognitive psychology' and 'wkhtmltopdf', suggesting a lure to a site that may host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/strik?utm_term=cognitive+psychology+definition+in+simple+words PDF link annotation
    • https://cdn.sqhk.co/pobumepova/h7zWXC6/lijulebedemufewekij.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/aiehiec/archer_barry_girlfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/zRhhYj9/red_lens_sunglasses_amazon.pdfIn PDF document text
    • http://kengoru.space/kafemipuv6141.pdfIn PDF document text
    • http://thelandofbadideas.com/dragon_ball_z_shin_budokai_3_ppsspp_free_downloadcqsmh.pdfIn PDF document text
    • http://hookup671.site/75866324112i7sul.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/ijYzjeh/what_is_the_managerial_revolution.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/eMHjgig/fejurujusukimexafejojixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivuraxut.rf.gd/breakup_shayari_girl.pdfIn PDF document text
    • http://sugizujesel.epizy.com/vmware_workstation_15._1._0.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/86297897411.pdfIn PDF document text
    • http://popeganezawojeg.rf.gd/android_tv_smart_tv_samsung.pdfIn PDF document text
    • http://bomigezi.epizy.com/xegetilobiwoninujuj.pdfIn PDF document text
    • http://teladanizuv.rf.gd/bose_soundlink_iii_manual.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5520 bytes
SHA-256: 71dde0bbe14c34d988b5dc173afa3756442f525f3efec43f8629565037e93e8e
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 10952 bytes
SHA-256: 3b4bcf85843edc79b42e8acb7b3a9a5c984a58c80e96191a208dab1a7328995f

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