Malicious PDF — malware analysis report

Static analysis result for SHA-256 1142f926dc984c34…

MALICIOUS

PDF

78.7 KB Created: 2021-02-22 08:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1a4aacd3139520c9eb5877fd86a4bbda SHA-1: 584780b2d22049e1488af08f5c45a1c8988e4ae4 SHA-256: 1142f926dc984c3406f7c4ea87e45211ec9145ef6993e1fb3ab3213d0a6e3758
244 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The primary link, disguised with a seemingly innocuous phrase, redirects to known malicious infrastructure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=perdona+si+te+llamo+amor+esta+en+netflix In PDF document text
    • https://buroxaserojer.weebly.com/uploads/1/3/1/0/131070485/0be8c5e257d1d84.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/4911701566db04d.pdfIn PDF document text
    • http://twenty-promo2020.ru/84664994544ef8ve.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/7168852.pdfIn PDF document text
    • http://dektesheff.xyz/balubamuziradaxizejiloxew25ywn.pdfIn PDF document text
    • http://4escam-bot.online/chunar_full_audio_songi2g4k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd6345dca287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fef103ff1856.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/5e906c4.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/gonad.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/01e6030e25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_600aa37f159ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_6003f982725f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_601bc27fb27fa.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/vowaxedobasipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_60288c41e73f3.pdfIn PDF document text
    • https://sunejojixin.weebly.com/uploads/1/3/1/0/131071277/kariwesiru.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://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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 4912 bytes
SHA-256: 8883696dda70071336497c63da0e5636a633c64946916f5d199cb9e3e0d28a72
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 11408 bytes
SHA-256: a11efc0bef7eaeb9049b44288b98e90e9b5f2157704e37ce5bf2cd290dd0011d
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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