Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddde9b44cee6f67b…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 23:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01ca1d00b69ac278afc99b0e61e0dd08 SHA-1: 115ef44a0dc24ff0a10861ed1a2331b2bfa33d92 SHA-256: ddde9b44cee6f67b25f6bdbfda41dc3446ffbfe1bc63e847d833b7453dc26552
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to obtaining an arborist license, which serves as a lure. The presence of numerous external URIs, many hosted on disposable domains, indicates a likely attempt to redirect users to malicious websites for phishing or malware distribution.

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/wb?keyword=how%20to%20get%20your%20arborist%20license PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fd28c8f99a07.pdfIn PDF document text
    • http://nusoxex.iblogger.org/what_is_a_port_when_booting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5ff944daaa7b3.pdfIn PDF document text
    • http://gofipupeseg.22web.org/wegenabewakimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_60298bb8d296f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fffc50175fef.pdfIn PDF document text
    • http://fasibada.22web.org/tarot_cards_for_sale_barnes_and_noble.pdfIn PDF document text
    • http://mubalupuzapo.22web.org/25340702251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fe9c62455633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_5fcac6b96ec1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490738/normal_5fda0f5e6f589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixudilasajigil.rf.gd/55436552439.pdfIn PDF document text
    • http://botevurisupom.rf.gd/craftsman_1_2_hp_garage_door_opener_keypad_reprogram.pdfIn PDF document text
    • http://goxakimolo.epizy.com/pabudutajofanelunafejoj.pdfIn PDF document text
    • http://kasunes.rf.gd/honda_express_for_sale_western_cape.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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 5260 bytes
SHA-256: 8ffc901d52d1cb9e6969517f723bc761825fb2a21ba54992ccf764434a140a9e
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10280 bytes
SHA-256: 45fe228b8199b36aefa3594f74348c4e3b616869b5467153fb42297633f0139c

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