Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc3e80f8f595f0a…

MALICIOUS

PDF

79.9 KB Created: 2021-02-11 19:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1158bcf7b80602edf9403711649a860d SHA-1: b4d80de76f9be4fc32ec9ff414f9c4e9590e2b56 SHA-256: 7dc3e80f8f595f0a829ba55d7be3f519b566969f47999757ece59921978fadea
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with a notable heuristic indicating it's a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'Ireland work permit form', indicating a social engineering lure.

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://jacksth.ru/wb?keyword=ireland%20work%20permit%20form%20pdf PDF link annotation
    • http://hurleyshamburgers.com/38551108879ojr3o.pdfIn PDF document text
    • http://hamsterbig.com/zed_counters_top04e27.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/gihbBhd/87043211710.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/Egfhc7J/32965243778.pdfIn PDF document text
    • http://bridgecommerce.com/procesal_civil_y_mercantil_guatemala2k6ij.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/JcdTnjc/pejapesavirisako.pdfIn PDF document text
    • http://13millions-warzone.store/cbs_sports_fantasy_football_rankings_tiersg1ah3.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/gV2hc2m/bunny_bubbles_rapper.pdfIn PDF document text
    • https://cdn.sqhk.co/kisetofekuzi/Ntjc0Vr/genetic_disorders_list_rare.pdfIn PDF document text
    • http://vandify.com/brother_dcp_t300_scanner_driverwvjfg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fea2316e44d7.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ha5X05C/find_my_iphone_turn_off_remotely.pdfIn PDF document text
    • http://blue-tick-central.com/spades_plus_app_pageae1kw.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/divexikav/blank_2019_yearly_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/xafuginogirepumip.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/gta_vice_city_stories_apk_aptoide.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/molawiluz.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_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 5100 bytes
SHA-256: b0ad23bb7c1a0c185ea69926959122fa0879e52e903b126edb40d3b5991f98bd
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 10828 bytes
SHA-256: 536b267c033082bccd3f2b17d0daa39ecd1198e034a5fef7566b84a789b1d709

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