Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20d6cb885286d93…

MALICIOUS

PDF

75.1 KB Created: 2021-02-20 19:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: af4f9105acdc65c2f6c13252f865ff34 SHA-1: cee345f2d65b1839a2226e9d7c555bf7f8a2abd4 SHA-256: a20d6cb885286d936cdb84966b6be5788e92925401dbd1720a530f8a54f09ade
96 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://jacksth.ru/', which is likely part of a phishing or credential harvesting attempt. The document body, though heavily obfuscated, suggests a lure related to thermostat maintenance, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=how+to+reset+flashing+filter+on+honeywell+thermostat PDF link annotation
    • https://cdn.sqhk.co/tategupet/ihiMMhf/black_screen_background.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_60240d0675e93.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/geNjggZ/instant_online_crossword_puzzle_maker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458150/normal_60008387e1a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd644c28deb6.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/licgcha/five_below_in_illinois.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_602b34d26f00e.pdfIn PDF document text
    • https://cdn.sqhk.co/nejijilo/jGHjjjf/65160688966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_600d8a7cb97e4.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/fNrvicb/dinghy_towing_guide_2013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bufipevuril/91354605483.pdfIn PDF document text
    • http://vesalege.epizy.com/math_transformations_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/appium_ios_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/aetna_better_health_of_kentucky_provider_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/catastro_uruguay_cedulas_catastrales_informadas.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/quest_belief_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 5124 bytes
SHA-256: 8992c29e391b95848000baceec37ce4bb058542075981131eb87c7bd3bc415cb
font_01_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 10776 bytes
SHA-256: 6e315b8c6651826ffd6ad7cbea756fdf98bfa925e37992fa424d9e41c35e35a1
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.