Malicious PDF — malware analysis report

Static analysis result for SHA-256 9318cbd8409ce0b3…

MALICIOUS

PDF

103.7 KB Created: 2021-04-14 08:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a0e0ffe3261e91db253bef3d093a831 SHA-1: d406dbcf825e837db6b4a9b644343fd9c6d9c859 SHA-256: 9318cbd8409ce0b36206c3fbf84b0a619857842a1a437419020d999c59ff8e2b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=cuanto+mide+un+metro+cubico+de+concreto
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/revaxukanoxu.pdf
    • http://dezlice.ru/xomazokaxogwamwt.pdf
    • https://xujoxufopugapes.weebly.com/uploads/1/3/1/3/131380539/84682.pdf
    • http://tamawasobo.sportsontheweb.net/area_and_perimeter_of_trapezoid_worksheet.pdf
    • https://fisokifife.weebly.com/uploads/1/3/4/3/134340906/zomejobe.pdf
    • https://zegemukugemilut.weebly.com/uploads/1/3/4/7/134707242/802268.pdf
    • https://cdn.sqhk.co/foroboreb/gaggjjO/take_grocery_shopping_list.pdf
    • https://cdn.sqhk.co/takularozo/aeLjbiy/police_siren_app.pdf
    • https://cdn.sqhk.co/valujoper/gcLicib/relofedal.pdf
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/22766b012a.pdf
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/tarepufape.pdf
    • http://keto-menu.online/huffer_down_size_guidek4uhl.pdf
    • http://bcipreactivaperu.com/ezdrummer_2_tutorial_espaol2qzjw.pdf
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/gudaxup_seloti_xixoxop.pdf
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/9416737.pdf
    • http://bestunew.xyz/wogisenimelatojonaxibykn.pdf
    • http://lalikexitaxixix.getenjoyment.net/vukokevekenatu.pdf
    • https://cdn.sqhk.co/dasofuduveje/bgeyCib/fun_questions_to_ask_the_office.pdf
    • http://copyrightsupporthelpcenter.com/vopojuwibelajojudopivotuwyzex8.pdf
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/xivimazekital.pdf
    • https://cdn.sqhk.co/nigigeje/o11pMFY/java_calendar_format_dd_mm_yyyy.pdf
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/4493306.pdf
    • http://kapovulup.mywebcommunity.org/jozasudorek.pdf
    • http://fikebek.sportsontheweb.net/36123144062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a4078cf6-8fa3-420b-ab61-258487076e43.filesusr.com/ugd/a3907e_98ac1e7a89454c858fda0de3850d15b2.pdf?index=true
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_7d470a8e0488405d99dbb99eecc36c9c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145a1.bin
1d8b1fb5c332f272740682610418699f78d4a34579241d58f59efc37b2a4352c
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A1 4920 bytes
font_01_sfnt_off0001563b.bin
4ccb45432f5a898cb73abae25ee772e0f4c3ac31ef73b8a892ef9acadd89dbe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1563B 13512 bytes
font_02_sfnt_off00018104.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x18104 4324 bytes