Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3dd1fd53a860f3…

MALICIOUS

PDF

75.5 KB Created: 2021-03-03 02:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2a0c328bf280d8a8b45908e3b4746ab9 SHA-1: a33ade4af2037c224a308245cba27ae508bf262e SHA-256: 1a3dd1fd53a860f372c2edbbba0d335f83c7319e3a559b4d2d6240f9fba0e13c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with at least one pointing to a link farm designed for disposable hosting, suggesting a distribution mechanism for malicious content. The document body, though heavily obfuscated, references a 'repair manual', a common lure for phishing attacks.

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://zajinet.ru/123?utm_term=frigidaire+glet1031cs+repair+manual PDF link annotation
    • http://my-favshoph.online/77643250550xvfbp.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/KoCoWhe/80772620339.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463275/normal_5fcc7d49468d4.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/how_much_to_charge_for_after_construction_cleaning.pdfIn PDF document text
    • http://wuxirumamep.iblogger.org/tisafatedew.pdfIn PDF document text
    • http://abzac.me/dutiverupukuxuvibatiwa7h3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_6008b21d48a5e.pdfIn PDF document text
    • http://byt-upak.ru/how_to_learn_hindi_in_30_days_through_kannadar5nlo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_600a1970969e7.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/cMgjEuU/fire_and_water_richland.pdfIn PDF document text
    • http://damvglaz1.xyz/marley_and_me_does_dog_diedvrt6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6010c7150e81b.pdfIn PDF document text
    • http://sobakin.space/81483178430ytgoy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefetuzuzip.myartsonline.com/gemikeloronogedure.pdfIn PDF document text
    • http://nufufud.epizy.com/tilizenifele.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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5708 bytes
SHA-256: d408cf49b4c2b1b69eeb7fd704ae28b21280dc87794193e99d1522dcea2e8712
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 10416 bytes
SHA-256: d2a7a08d3b2f0968f6989f163cdc981768a8041f3183b59aa6d8102f451ff8e5

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