Malicious PDF — malware analysis report

Static analysis result for SHA-256 662f3bc2bc193099…

MALICIOUS

PDF

73.1 KB Created: 2021-01-27 15:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7f24760c366cf2dea479411cc4a27775 SHA-1: 4ea67a568e87c8c37a2818d13b02a73ce4a1fa15 SHA-256: 662f3bc2bc19309931e1fb1de9e6c284a1b36efe62fc9576218d2d6f0470b877
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous embedded URLs, with one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'inspirational teacher quotes'. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a phishing or malware distribution attempt.

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 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://jacksth.ru/wb?keyword=inspirational%20teacher%20quotes%202020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5fdc5d0fa236a.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/siiHicU/sasitinonudabesovobaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/dc6ggih/free_slots_fun_net.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492281/normal_5ff22114e6a5c.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/ljeExdr/snowball_new_horizons.pdfIn PDF document text
    • http://lefenup.22web.org/excel_vba_application._worksheetfunction._sum.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/dGjaiax/cross_stitch_patterns_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_60103ab60b4ee.pdfIn PDF document text
    • https://cdn.sqhk.co/ropesuzuruf/4jey0ha/54124614296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5ff42d08a1630.pdfIn PDF document text
    • http://kdghy.online/karcher_dry_ice_blaster_for_sale4wv9t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabozet.epizy.com/app_lock_fingerprint_free.pdfIn PDF document text
    • http://xegubidutanaza.epizy.com/bicycle_thieves_film_songs.pdfIn PDF document text
    • http://jegajumofi.rf.gd/madhura_raja_tamil_collection_report.pdfIn PDF document text
    • http://kidereludabiron.epizy.com/mewipukejepadokedasozixip.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5360 bytes
SHA-256: 74d75086b99eff4a7e5fb631888b241b32700aeeb361dfc8a289413f438a5842
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 10576 bytes
SHA-256: 1d4a8d411936d32449b4e8da7fba9e310bfd828ba54dd2970c2d571ecfbf6ec7

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