Malicious PDF — malware analysis report

Static analysis result for SHA-256 1411c803b1b53358…

MALICIOUS

PDF

77.1 KB Created: 2021-05-17 09:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d7208a5612f28f5449952b4075d38b37 SHA-1: 5a019e24d5f51be7e2641de1d1a26720326635c9 SHA-256: 1411c803b1b5335826196957c9288180c4f8ebc14b50e6e93fc37907cd6b7020
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=samsung+rfg297hdrs+user+manual PDF link annotation
    • https://loxujuzif.weebly.com/uploads/1/3/4/3/134368844/82e9bad3e.pdfIn PDF document text
    • http://pegizovi.iblogger.org/ejercicios_clases_de_sustantivos_5_primaria.pdfIn PDF document text
    • http://vowuzemiru.medianewsonline.com/60138139928.pdfIn PDF document text
    • https://vuganolo.weebly.com/uploads/1/3/5/3/135314000/d16831db216c.pdfIn PDF document text
    • http://persequen.com/76295252418hn5q.pdfIn PDF document text
    • http://bitukab.iblogger.org/rogafamebesumasakaf.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/nuvuj.pdfIn PDF document text
    • http://openplafond.xyz/57355003418olqi3.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/291db97d.pdfIn PDF document text
    • https://sofasiwo.weebly.com/uploads/1/3/4/3/134319993/062c8aff7.pdfIn PDF document text
    • https://mojekofodu.weebly.com/uploads/1/3/4/6/134673543/tenitatutukozutopuv.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/grade_2_math_time_worksheets.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/97c2e8ec-f9db-486c-bfe6-129d651f6236/31019159589.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/1002419706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bceaec2-2696-458b-aa5f-2c37c5dcf0e4/tisiritipoxikixizixumuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d895b67-332a-4f70-b767-af4e6faa0d06/the_onion_presents_our_dumb_century.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/fituliworesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/608f9e4c-a3c6-4d46-9ace-40814f56b6aa/how_to_become_a_forensic_handwriting_expert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d12264-ab93-4437-8d89-273c63f3f9ab/37680099816.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 5792 bytes
SHA-256: bf5034db07d9b3f27b1983989506e35514e0da0329844de398c860415770b936
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 11220 bytes
SHA-256: 9cddf383d569857ef39a876f3baeb26e8b90c554dd78d61b8331f3eae87bc9cc

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