Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd78de1b956c9dea…

MALICIOUS

PDF

71.2 KB Created: 2021-03-15 03:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 752b1682e262f040a976c59844631081 SHA-1: 6bab24a075d8e137285e14729b5dddf6d97ade9c SHA-256: fd78de1b956c9deaf336b089e7f48eb2a52945fa23a7cbeddabcf79ae625b4ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'notary study guide louisiana'. The presence of external URIs and the ML/ClamAV detections indicate a likely 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://leonvi.ru/wix?keyword=notary+study+guide+louisiana PDF link annotation
    • http://fawanajaxape.22web.org/can_you_grow_tomatoes_in_the_fall_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/ajjjfmO/bluetooth_music_player_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/hhjhSia/engine_oil_guide_south_africa.pdfIn PDF document text
    • http://wexebigusokata.iblogger.org/67276687676.pdfIn PDF document text
    • http://dafomexo.22web.org/addictive_drum_2_full_version_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_60140c2668475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fd161eaf4197.pdfIn PDF document text
    • http://shopsmmv.site/aha_hypertension_treatment_guidelines_2019t7n26.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/egBgclb/where_to_buy_jolted_cow_ice_cream.pdfIn PDF document text
    • http://vorgazme.com/mes_140_smoker_reviewsg565k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_6027336a4fb7c.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/kezemiradigu/kuwamojat.pdfIn PDF document text
    • http://jadigilotuziwir.rf.gd/firefox_for_mac_app_store.pdfIn PDF document text
    • http://goxabobuti.rf.gd/12243238344.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/65255632953.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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 5064 bytes
SHA-256: 3f5e2c9090ad63b3fa8fcef5c6245d9a8ef51cebe08488a800792d9e951b9a81
font_01_sfnt_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 13000 bytes
SHA-256: eb7fee9a0c13fd6cf9a4726be906a1969d03c74d34eff8570aa0d88ad73ab01e

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