Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3ca21b0daa709b…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 14:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 00f9f56364f85852f91d2ed6d12fc3bd SHA-1: 1f23c57b926d861465a4cad0e7628deca9f3711d SHA-256: 8a3ca21b0daa709bd6699cffb1adda3d0ea0ed8667c80d5ff905c989fe55395c
186 Risk Score

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 0.9997

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://bologen.ru/123?utm_term=cute+baby+kiss+gif PDF link annotation
    • http://koprovk.xyz/gemuzadatozosewijektzf4.pdfIn PDF document text
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/45b843a.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/5586000.pdfIn PDF document text
    • http://fajivujozivezur.22web.org/bhoomi_rtc_online_app.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/e5de6f2a8a.pdfIn PDF document text
    • http://toppiksnack.xyz/compassion_focused_therapy_worksheetsrf9h6.pdfIn PDF document text
    • https://muvuvudu.weebly.com/uploads/1/3/5/3/135351086/4775140.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/cluster_sampling_advantages_and_disadvantages.pdfIn PDF document text
    • http://flowerport.store/siwokojebiwu3f4d9.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/digosutel.pdfIn PDF document text
    • http://waragofekoxexaz.sportsontheweb.net/carlos_castaneda_gli_insegnamenti_di_don_juan.pdfIn PDF document text
    • http://reduslim-siteofficial.site/72679955613y9nfx.pdfIn PDF document text
    • http://piredvizhnik.com/rafifugakadagewebeder6x7vy.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/foxezelabewiko-satadep.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/2925372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudulumunir.epizy.com/83774791794.pdfIn PDF document text
    • http://diroxowevigem.epizy.com/cape_town_map.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/microsoft_word_format_loan_agreement_form.pdfIn PDF document text
    • http://lulorabero.epizy.com/81934629793.pdfIn PDF document text
    • http://nabepazefesuju.epizy.com/tizuz.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/academic_writing_real_world_topics_free.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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 5020 bytes
SHA-256: 8743fd3a9978723a0c6d78ea785472ae465c52da659ce876e8c4dbf8b78efd6e
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 11432 bytes
SHA-256: 5213ff6f1dae3bcb04fe2b0bc40cbef4819442ebe06e03d9c786a68784f16d17

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