Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da78954d5af35c3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-17 05:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 77ffcf72694a5920f2b78a31d4b0c116 SHA-1: a6d38175be910ec150d1b1d1315f934f807965e1 SHA-256: 3da78954d5af35c33b29dca6c931f0c9295f3c93cbc7b0aee493314fc2a5f6d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=interior+design+colleges+in+florida PDF link annotation
    • http://bidovanuketere.22web.org/one_page_bootstrap_website_template.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/como_converter_para_autocad.pdfIn PDF document text
    • http://tonorubur.22web.org/65888451769.pdfIn PDF document text
    • http://fosasovizi.22web.org/gebokitunafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kilarosine.atwebpages.com/what_are_some_good_workouts_for_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e8dc77-6153-4cc9-a1b2-f803bb994fce/tadedomofaxevusivino.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_fc10d030bfc247b186ada6eeaa2988bf.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_b8af4bf999eb4befb34f10f0235ab2b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/657a9ba7-f8a6-4a2b-a082-64a90d00fc3d/jewowugodizuratilitizos.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/tax_bracket_changes_for_2020.pdfIn PDF document text
    • http://rokidibamufoduv.epizy.com/graduation_reception_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b935bda-c4fb-4a87-bb21-daaab95e63af/58180026577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc51480-d3ab-4a2f-b411-e58f99c168f9/24725061409.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_1039a03a0f454c39a5dd497a592cc62c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/pefolonebabomaragige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5667203-35d7-49f1-9f83-612e35735a5e/sig_sauer_p238_review_hickok45.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_ddcfcfedc41d42bebaa4ad22887117d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/tesujurago.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_f3ceaf33112d4b8e8d216d06272ce51e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timituvupame/jack_o_lantern_faces_template.pdfIn PDF document text
    • http://rexuxos.rf.gd/how_to_create_a_diversity_statement.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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 5128 bytes
SHA-256: 11294f73a8be3a2fbec09282d7541f7250971c8506512a0c6a8102ff66e2f18c
font_01_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 11680 bytes
SHA-256: 0040e92acfebf8deaea9917fac544bf2bb0b2cca7881b807dbca72dc2dcebdd1

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