Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b63c4d85934dc59…

MALICIOUS

PDF

69.0 KB Created: 2021-03-20 18:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f040d059d1431542a9c2e76d1d7c117a SHA-1: b1c790d72829109a43eca39b4dbb013b90856ae0 SHA-256: 5b63c4d85934dc59d5ac80475e10328ee38bcecfb84192919b1a8f2f7473ccfa
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 0.9992

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://pelibifir.ru/123?utm_term=wordpress+custom+login+page+template PDF link annotation
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/lifepafuz_piwat_pagirevorateba_lumonikexufegab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_6043e1077a420.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/meniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_60110d97c1144.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/8492243.pdfIn PDF document text
    • https://kukuwusak.weebly.com/uploads/1/3/1/3/131379738/c67f19877d64.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/d3jathd/papa_pear_saga_como_conseguir_boosters.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/tugoxopinemiwo_xefawadimaram.pdfIn PDF document text
    • https://cdn.sqhk.co/kezulegol/fLhdkjj/introduction_to_reporter_gene_assays.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/gMibMPZ/online_chat_rooms_for_depression.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/age8Ogj/jenunalibadatifazapafetu.pdfIn PDF document text
    • https://xonesomo.weebly.com/uploads/1/3/0/7/130739362/7840234.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/faxit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fdc8de3b953f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60290ce072b98.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/kijik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5feafd5ede2db.pdfIn PDF document text
    • https://vobelorigod.weebly.com/uploads/1/3/4/0/134096073/990456.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/8788982.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/936e5f79-96b3-4003-9eb8-65ee3a047e7e/ryujin_3.5_tail_cp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4603dca-d763-405c-aaf9-cf6539a1c88a/acting_books_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e6f164-3f8e-4ae7-9df3-9ca6e81beb68/vefanaxumumonola.pdfIn PDF document text
    • http://norenuwidubeg.rf.gd/madden_18_strategy_guide.pdfIn PDF document text
    • http://nabasuxogakuwet.epizy.com/hunger_games_book_1_chapter_7_summary.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_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 5404 bytes
SHA-256: 91ef8d73c731a31a92fc276006fd0278b5eb96b593eeea8add55e8bde31d5701
font_01_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 10080 bytes
SHA-256: 35d1bd1490cb3d486d3d55d81c4e70f0993013b931944014cf2f85f95ba937c2