Malicious PDF — malware analysis report

Static analysis result for SHA-256 38888a435ec152c6…

MALICIOUS

PDF

69.4 KB Created: 2021-03-14 01:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 061bc68f7f4bd85282b4c27dd45f439a SHA-1: 89a159f35c8169631a2e9e20bf7e38913fbbe3b7 SHA-256: 38888a435ec152c6ed745275513cf4cf9f5af1c8b6be8a574d6f6034b1d00859
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to distribute malicious content.

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://lozipotod.ru/wix?keyword=larson+algebra+2+book+pdf PDF link annotation
    • http://nimuxixoxa.22web.org/reading_comprehension_exercises_pre_intermediate_with_answers.pdfIn PDF document text
    • http://noruxonek.22web.org/87869058270.pdfIn PDF document text
    • https://cdn.sqhk.co/madeparev/BMejbtP/search_quranic_verse.pdfIn PDF document text
    • https://wazevavipedad.weebly.com/uploads/1/3/4/4/134484144/f21189e0b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_601f477425ca8.pdfIn PDF document text
    • http://fojozefamofu.22web.org/bhairava_music_ringtone_free.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/memuragex.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/fLwBjbm/33257468272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_602ae1a757245.pdfIn PDF document text
    • http://basujenos.22web.org/etina_pro_cizince_a2.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/8420126.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/hfMhbge/44750651743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db966002-0a7f-4eea-a3e1-4779b71b458b/vovilexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ef4bb8-82a2-43b8-b007-61611edfaed7/84709313319.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/lovej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82d446c-01e4-48cd-8ce0-d929eca49e3c/brandon_sanderson_stormlight_archive_box_set.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/nawamevopudavemudupob.pdfIn PDF document text
    • http://vuzoziwulof.epizy.com/1646642310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c5012c-2504-442c-ac6d-d40c759b78f1/free_android_app_development_course_udemy.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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 5484 bytes
SHA-256: d1ff5d1e6297e53860e54df985927575475f9ef39084714d3b4a52669e9d52cf
font_01_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 11440 bytes
SHA-256: 848e283b309c732cb8a5423d1d6fb8a96094a63f1c3a1ff8919c5aa9503b19e1

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