Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88f435f47d64d3c…

MALICIOUS

PDF

72.7 KB Created: 2021-03-11 19:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d0c333c78fdfbeba32e75864ea0e46c SHA-1: b8a762cfca5f39c44a6b91a5a5634bcf0c8d4593 SHA-256: c88f435f47d64d3ce28e3c878c1de549ca32e4c816f6cc6fc2b7ab32a09bc924
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 0.9997

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://fokemale.ru/wix?keyword=ip+man+parents+guide PDF link annotation
    • http://nasty666.space/56654514891jqvad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5fc78e823b739.pdfIn PDF document text
    • https://cdn.sqhk.co/pitewomepe/SSdu0hR/13428370785.pdfIn PDF document text
    • https://cdn.sqhk.co/reteduze/jjohfjb/temezepibamipojekexese.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/dia9tLH/photo_editor_lyrebird_studio_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/ibhajjg/santorini_island_villa_rentals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_603a56cd42ed6.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/dhediba/mineposobojojodu.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/uhihfgf/86469868972.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/IKiicgj/sage_exploration_production_inc.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/XkBhijj/88349057607.pdfIn PDF document text
    • http://endi-itali.space/zajilowerenujonizogoncmynb.pdfIn PDF document text
    • http://cleaner-inn.club/the_beautiful_poetry_of_donald_trump0vxwy.pdfIn PDF document text
    • http://bhd-management.space/occupational_therapy_clinics_near_meepkv6.pdfIn PDF document text
    • http://new-leggins.site/irish_general_knowledge_trivia_questions_and_answers09qlx.pdfIn PDF document text
    • http://believes.space/cisco_ccna_security_official_exam_certification_guidemt0p7.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/7JkBzMQ/3541492555.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/ghjiDdL/leap_day_birthday_wishes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_6047dfddec5c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_485015f33a3d4f3889806f4cbb581160.pdf?index=trueIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_19c4138723cd47c781cc3c2135bf1815.pdf?index=trueIn 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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 5184 bytes
SHA-256: e0c4e19de6c067c60b688af1a29adc66f8f89ccb846aa22b556d678e63886b90
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10460 bytes
SHA-256: 6764aafa9a929671a5807d23374475e77b7ff64778d822baab2de8ff8bb02f36

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