Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb7aab816f28a6…

MALICIOUS

PDF

86.3 KB Created: 2021-02-27 00:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1350a09bde8d313fbd1fab38fdaef428 SHA-1: 34efde55606a15f389e4465cc954c3373cdfd2dd SHA-256: c1fb7aab816f28a6c62f8b47ef7eb13884b0b8c2381626aec80b9d34590b5070
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 pointing to disposable domains and hosted on services like weebly.com and sqhk.co, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users.

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://dugedepap.ru/123?utm_term=what+does+the+term+jumping+the+broom+mean PDF link annotation
    • https://cdn.sqhk.co/botuvawezej/4eijFgf/51984618261.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/5566702.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/science_and_sanity.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/idE5hbe/88845757835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419640/normal_5fe0c18c71553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_5fe787f24d15a.pdfIn PDF document text
    • https://cdn.sqhk.co/xujuvotu/ebyjhZ5/drumsy_vr_emi.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/idl8Rif/clash_of_clans_th8_base_tips.pdfIn PDF document text
    • https://solebuza.weebly.com/uploads/1/3/1/4/131453496/loxegosoreka_mijekadiwati.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/can_spread_betting_be_profitable.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/pakutonetuxisuxebofebiter.pdfIn PDF document text
    • https://cdn.sqhk.co/rawavuzom/hibAidu/28007264858.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/hbYWhjJ/56242251140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_601acc9caf1d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fdfdd9070af0.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/Mihhcjc/77911835671.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/think_and_grow_rich_ebook_kindle.pdfIn PDF document text
    • https://witatubaf.weebly.com/uploads/1/3/1/6/131606367/rojag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/joker_script_leak_4chan.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/dilak.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/focusrite_saffire_pro_40_installer_mac.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_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 5572 bytes
SHA-256: 185a5c696ca4d2a017dd4c8e0e8aef1e80999baee46b3451fb9eb5f5eb0bc4d8
font_01_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 11184 bytes
SHA-256: 7b1a85c78dcd937709a92871c5f35a6abbd89f481dd0a5ff6cffe9e0ea07b038