Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a442f9b867d0581…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 07:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 46828d0ed0fc29557755bd5184ada979 SHA-1: de62b7f26c89b00d464f61cb77d8027270d532f2 SHA-256: 9a442f9b867d0581ac42191e5f7e7653c1e64d23ef5cdbe88a17909d30471b51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/wix?keyword=biology+second+semester+final+exam+study+guide PDF link annotation
    • https://cdn.sqhk.co/gozolijitow/1hjgIZZ/hangouts_app_download_for_android_phone_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_5fdb8e0d25277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe591bef3fba.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/yaesu_ft-450d_qst_review.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/5944656.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/how_to_adjust_needle_on_singer_sewing_machine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fdf15b88c7a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_601420ceb3388.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/VjiI7Ns/jumaw.pdfIn PDF document text
    • https://tiparopodewab.weebly.com/uploads/1/3/5/3/135340776/lunamizemo-midinami.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/vibunurerumikibepujidiju.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/14921598864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394077/normal_5fe5fbc52aed4.pdfIn PDF document text
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/vaxaputotejewaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/fiddler_on_the_roof_tradition_violin_sheet_music_free.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/business_analytics_program_salary.pdfIn PDF document text
    • http://duribolatajofa.atwebpages.com/jetunimonedafusaralik.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/sezowekoxomenexoxe.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/95798204249.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5560 bytes
SHA-256: abfe57e5a1b556a071af626bf57d5cc09ba8e474caec70f54a5d917a386d8fbd
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 10240 bytes
SHA-256: cc11f23d8e2895e0402bb8e7f9df8ac468c1e675a9a73de0872b009f27937f1b