Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2d9f144dbb6927…

MALICIOUS

PDF

85.7 KB Created: 2021-05-25 08:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 20d034f4a640e3c2cb1a4e4aa81be0fe SHA-1: 6d56f66185f11b061f27b37899851679d717f71f SHA-256: 5d2d9f144dbb6927ecbf1a28931e0b3f4ce1d0b3040da9285854b429cbc55258
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, 'https://xezojetit.ru/strik?utm_term=ejercicios+de+fisica+mcu+resueltos', is presented as a search result for physics exercises, likely to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=ejercicios+de+fisica+mcu+resueltos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420013/normal_602c7641d89ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370072/normal_60074deb22aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_603a7789ad79f.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/8405274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_5fd0b8de4c9d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5fcad6faa87e3.pdfIn PDF document text
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/golamasovudisoweleji.pdfIn PDF document text
    • https://sobafezusebe.weebly.com/uploads/1/3/5/3/135335887/0332f360caecb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_60365c045fb0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_601c760f96df4.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/votawawo/how_much_is_a_miniature_wire_haired_dachshund.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/bully_gameplay_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/zopuvikazutobedi.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/buginajenuwakadexemurora.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/60618238029.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/banco_de_venezuela_pago_movil_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/what_is_1000_as_a_decimal.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/lifotoretike.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/jexarepap.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/restaurant_employee_review_form.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/31843923940.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 5200 bytes
SHA-256: 21a7522deb14cb53d987a5c94f3231b8c801854c3e3b3a295ff08b08be885f45
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 3420 bytes
SHA-256: 2855024c05cb54b61c92ed206b6ecc910abe516c64583b341f381c4dbaab7b83
font_02_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 12036 bytes
SHA-256: 0b87901d28f07cad2ddd7af4dc6dc48d0e00932ea35e9fb1a5380b6264230e3e
font_03_sfnt_off000131b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B3 16968 bytes
SHA-256: 50417e3eec952553dc4e3e689a10e1111c87d96bae23e12609dd709f62b3d03d

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