Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9f22902889ab99…

MALICIOUS

PDF

77.1 KB Created: 2021-05-31 04:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b6cbf1de94a9d8f9a485a5f97c7ccedb SHA-1: 78383940513570884ed238f11cc211712b12728c SHA-256: 6d9f22902889ab99fa0e0dd4dc58b5a0eb18fb5bf4c24bad5cfda231676c1d01
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting services and appear to be part of a link farm designed to direct users to potentially malicious content. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=is+wendy%2527s+breakfast+sausage+pork+or+beef', which is likely used to redirect users to a phishing or malware distribution site. ClamAV detection and ML classification further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=is+wendy%2527s+breakfast+sausage+pork+or+beef PDF link annotation
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/forapewegatufib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_60249d5e7e4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_605419ac527ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_5fc59efa63fb1.pdfIn PDF document text
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/15f60463.pdfIn PDF document text
    • https://lulolopan.weebly.com/uploads/1/3/5/3/135323706/758f398720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fe55fee0f65f.pdfIn PDF document text
    • https://ruxuxosiforedop.weebly.com/uploads/1/3/4/4/134491380/4aed80bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_6064bf1c20823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6022d92c8e562.pdfIn PDF document text
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/16df38a49.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/4c7a681e-884b-4730-aea4-d26da30e85d3/poluxanurilukude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ce0434-2372-4cb6-9d63-53c5c18a318f/sikododo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69231cdc-c41b-40fd-bf58-4033302da59a/is_hbo_max_free_with_apple_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e20448a-80d7-447e-af67-f4209c5bd8d1/dunkin_donuts_breakfast_menu_specials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e054cde9-08de-423c-a4b9-12cc1acabde5/ncert_class_10_maths_book_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0837a4a2-d5a8-43d0-a414-8732e1a52312/silence_becca_fitzpatrick_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017571a8-8292-4aa5-a617-81b996e147f5/zikilobugarekudifo.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5548 bytes
SHA-256: 36a70e0ee70cec0b9e49fd47a0cd4b288b36630145669534fcaa393e7e8caa7e
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 12112 bytes
SHA-256: 6c8332be05565b6a831ec8333a90c91da4d22f7440848a4979de2976eeb994ad