Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a77b4620a09868…

MALICIOUS

PDF

78.5 KB Created: 2021-06-02 14:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: deccd57be33abf07cc6c4a4e1f89f104 SHA-1: 51abcdc557b4f3250e75ec9e82bb3c674aca2e13 SHA-256: e7a77b4620a098680484ce9439e393e4c4ad8b3260503816aebcb2cd8160e52c
166 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. It uses a password-protected-archive lure. 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 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/pbw?utm_term=what+does+it+mean+to+wipe+cache+partition PDF link annotation
    • https://duzebovad.weebly.com/uploads/1/3/4/3/134316699/658bee908f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_5fe954ab91244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382773/normal_5ffef1ef2c1e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370319/normal_5fc8ebc08cec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5ff75ab348680.pdfIn PDF document text
    • https://xifepifedezuz.weebly.com/uploads/1/3/4/4/134495844/472bef0c3598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5fc6dea9908d5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4461786/normal_60b0002f00c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_603b931f89007.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4385850/normal_60b1c66fd87ae.pdfIn PDF document text
    • https://dabemevabun.weebly.com/uploads/1/3/4/4/134476179/dovadezuvodirorinoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_6063cda7e4409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tusoxefum.pbworks.com/f/tukojuvuwaxur.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/sample_cv_for_undergraduate_scholarship.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/xetarupokadedititukede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be138ee0-37ce-4288-af6e-d1a384b79d44/wunilewigub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117cdbdb-108d-4c69-9ff9-09a01b550655/big_love_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa16922-84de-41d8-8ed6-06e6f87b1700/23154222979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9e6eae-7dea-42db-8a33-39a241ce9aeb/63651296527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16d786cd-ed9e-40ef-977e-17e79b63576c/best_flirty_texts_to_send_a_girl.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/begomananalixusozigo.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/element_3d_2.2_pro_shaders_plugins_pack_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a7ab38-826a-462d-9bb1-582738b58e5a/public_speaking_anxiety_classes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554aef10-07ec-4e1d-8977-1dff65acc983/70888756426.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 5172 bytes
SHA-256: 228f1af04c6040e511fdc4fbdc78786aa49e1011a80105e9f50e11194b6e751e
font_01_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 10576 bytes
SHA-256: 1e854127a1471935b0d47a75a22d17237cd360457637f79f96ea8b43b0257cf2
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3