Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae69d7aa785ca7f…

MALICIOUS

PDF

77.5 KB Created: 2021-04-02 12:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 570ed74108bf143ca77919292f48edb6 SHA-1: 54a0b52709220d2302269e0fe316f1abe3e861a5 SHA-256: bae69d7aa785ca7f950bfceeecbfd3bc35cb5113375ca390941eadb3f5cbba89
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=when+did+school+finish+2018 PDF link annotation
    • https://sapefita.weebly.com/uploads/1/3/0/7/130776655/tawalar-puwavagi.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/remdio_caseiro_para_cseos_amigdalianos.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/5644468.pdfIn PDF document text
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/9fb5ca.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/emotional_intelligence_research_articles.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/10005531792.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/26146550905.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/3105de3a.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/xezamimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5feb34c50622f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_603b13f3e76ef.pdfIn PDF document text
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/754023.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/benefits_of_agritourism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_603f244326637.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/witaliz-zoxerajagulegi-boterore-xovaz.pdfIn PDF document text
    • http://danoguvokapijof.medianewsonline.com/ugly_duckling_story.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/bb82bbd1-d181-4e4f-975a-5377d9b8cf63/26974298707.pdfIn PDF document text
    • http://bozagasixafovo.atwebpages.com/cache_memory_organization_in_computer_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c625517-34f9-4abb-be24-0a83ce7c4a1f/shure_ulx_d6w.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/wps_to_word_converter_mac.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_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 5336 bytes
SHA-256: e70dd72afa4a906c59c5e368c9d6b3d1a0d117f4f5c87d6af7fcc0d764e22c4e
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 10852 bytes
SHA-256: 9da4fa1fcb93c093d136e21bd1136300e3424e8b3479eb4759c437517c6acf11

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