Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dbfdecf0dcefe7…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 01:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f120d2b942c60db5c4a0684ce08941 SHA-1: 72d45933e68ee9ec558ea8276bb6a616b0bcf426 SHA-256: 28dbfdecf0dcefe7fe79c44a18aaa051c19f6514b764e684460b2cd18ade8b58
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 a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to a 'reset filter warning on honeywell thermostat', suggesting a phishing lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=reset+filter+warning+on+honeywell+thermostat
    • http://edevletorg.com/50560010320olo6c.pdf
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/felasan-mavodoziwokuteg-wadalewozip.pdf
    • https://cdn.sqhk.co/mugodetutag/gjeWhgo/virunepibodotuwaxo.pdf
    • http://salleapp.xyz/electricity_and_magnetism_study_guide_5th_gradefk0x9.pdf
    • http://1offpark.xyz/what_do_navy_officers_wearfcerh.pdf
    • https://jofogeva.weebly.com/uploads/1/3/4/5/134505403/lelaliravoxa.pdf
    • http://riniwodifole.medianewsonline.com/meneliximotonisix.pdf
    • http://mozobadijoba.medianewsonline.com/39487039642.pdf
    • https://cdn.sqhk.co/vuwonesi/WsEzDhg/zadapizoxuforu.pdf
    • https://midonoguta.weebly.com/uploads/1/3/5/3/135347847/sawudafiwajuxuv-genonemika-bewawexerotut-ririwojinor.pdf
    • http://fitit.space/what_is_the_purpose_of_the_emotional_guidance_scalekuh3k.pdf
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/vatemepud.pdf
    • http://wssummer.space/diy_hydroponics_systems_builder_guide7ox8x.pdf
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/3902141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a6b7c5d-7fac-4c35-8bb8-a01f02b0f9c7/48222324038.pdf
    • https://uploads.strikinglycdn.com/files/024f9fa6-20a5-4256-8d58-d44b3b389906/cub_cadet_parts_manual_download.pdf
    • https://uploads.strikinglycdn.com/files/ad9928b1-d2a9-4609-acdf-94de74f8c21d/giferojifikusofafuta.pdf
    • https://uploads.strikinglycdn.com/files/f84370ae-ed41-4a37-b969-6f8aff48d86d/3525992803.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f202.bin
f0fffdb3862267f23b79d47c2b4a6100208176876fa5234dd723f3d80994eb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 5384 bytes
font_01_sfnt_off0001043f.bin
6a73312782860722e1ffa0bad82968cd735378f0013c61817031ad72d7003790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 10632 bytes

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