Malicious PDF — malware analysis report

Static analysis result for SHA-256 2973d9df457a51fb…

MALICIOUS

PDF

84.4 KB Created: 2021-04-18 19:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 16b12ef739983d1018fe93dbc10689b0 SHA-1: 03acb2eec87074242e0e53fa66a67d585e5fd21a SHA-256: 2973d9df457a51fb851e920d2fb09c4d95297636f08950b4ada610de39f6a3b3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://dafemum.ru/strik?utm_term=artscroll+siddur+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc85c340823e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5fd64d975ba20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407069/normal_606e05ba57c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_604e08e9b6856.pdfIn PDF document text
    • http://kimisorunutom.medianewsonline.com/feziserodu.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/bypass_capacitor_calculation.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/wexafamulipinefalexetib.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/viwoxuz/vuxumazivumeginutix.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/84100081623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f9300c-9f2b-4579-ac13-5516fbbb8489/bawusa.pdfIn PDF document text
    • http://widifusi.myartsonline.com/how_to_install_offline_google_maps_on_iphone.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_1001750a76e9456da84e0f9ee308de5a.pdf?index=trueIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/14806735883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb11bfe0-982e-4d43-840b-2d841d1e3081/pc_troubleshooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/saremelojebaruzopuror.pdfIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_0286e69dfa50495ebfbd371ce93c40c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petikamov/jquery_ajax_post_data_from_form.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_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 5056 bytes
SHA-256: 67e176c9b0304543529e4bcca17303ab9993e74c73da526b743e6b679640913c
font_01_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 10784 bytes
SHA-256: 065cea8d78c799a9436cb8396543944e6b89728de7164c3fcee1ca4d2515c6e9

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