Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99684dd3c7b32d5…

MALICIOUS

PDF

69.5 KB Created: 2021-04-05 17:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 142241350485f1dfac89ace3521f7d80 SHA-1: 74c1c14d047be435c23d1691f53486f03dbf657d SHA-256: c99684dd3c7b32d5c83aa0555cb8a5822cd9ca390f397f422e77f4b599d6da9f
126 Risk Score

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 0.9997

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://jumiwimov.ru/award?keyword=berliner+platz+1+neu+deutsch+im+alltag+intensivtrainer+pdf PDF link annotation
    • http://llloooodddd.space/dawekvlmhe.pdfIn PDF document text
    • http://bikuribowe.22web.org/dirio_ntimo_lima_barreto.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/curso_de_cabala_gratis.pdfIn PDF document text
    • http://bilkan.fun/primerica_rep_salary2rorm.pdfIn PDF document text
    • http://reform-st.ru/shirley_jackson_short_stories_online4jtfr.pdfIn PDF document text
    • http://sale20.site/the_farmer_s_dog_uk_reviewssfetd.pdfIn PDF document text
    • http://lovepositions.info/dipujubeveladd1h3s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubesakitulifo.epizy.com/vepikijeponimodexererav.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/ccdp_arch_study_guide.pdfIn PDF document text
    • http://javasuk.epizy.com/picsart_latest_version_cracked_apk.pdfIn PDF document text
    • http://mafikaxavetubod.rf.gd/97698695620.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/lapakid.pdfIn PDF document text
    • http://walazej.rf.gd/97946410576.pdfIn PDF document text
    • http://damexodawu.epizy.com/zurum.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/bootstrap_form_group_row_center.pdfIn PDF document text
    • http://kedojaji.epizy.com/zofezavomenurofonexasi.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/vidmate_new_latest_version_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/75871951000.pdfIn PDF document text
    • http://livunus.rf.gd/73548643213.pdfIn PDF document text
    • http://magomodatibotu.epizy.com/powerpoint_minimalist_templates.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_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 5780 bytes
SHA-256: 4042f48fd9e784d18ac5cc492b5883c80c2e433a4e519590a6adb7a868337edf
font_01_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 11764 bytes
SHA-256: d29d55a267f47773cf64550af5e547fa1f609688b1814f857984bbf523535213