Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d836063bcaee79…

MALICIOUS

PDF

88.2 KB Created: 2021-03-17 10:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3193257337db99dd1c810eecbeaca15 SHA-1: 5850021dd0c178516a0ab91a3cebd520b99b7c80 SHA-256: 28d836063bcaee7964f7a642ea4732323c66fffb525abf5cbb283f2ea7250aa3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure. No scripts were extracted, but the presence of numerous external URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/wix?keyword=maine+pick+3+pick+4 PDF link annotation
    • https://cdn.sqhk.co/remimuroku/d0Fjjgg/39647655142.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/tolalalorid_sogujojexefi.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/gotoxaviseluka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_603d238dece18.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/8908518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fd31eb690594.pdfIn PDF document text
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/xokoropisira_jodabekogo.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/C1agegg/78861744406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_600d8ddd092fa.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/hgfgeFS/easy_cash_wallet_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/bibjfia/17523255257.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/police_community_relations_programs_in_the_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/GkAhidW/85095781895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_cf6eaebf1e8e42e6816a70c9b3fa1232.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/two_dimensional_vector_dot_products_worksheet_answers.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_b59d5774cbba42fba6a438013dbc88a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/romiten.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/34684728705.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/gudasedikudenegafumujomis.pdfIn PDF document text
    • http://tokozod.myartsonline.com/kozowapofufajibipub.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_92a4a0f2bfb14683a1f8517f315f45c5.pdf?index=trueIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_87aaca9013234d74ad9785f2ef26df08.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_79054b17fbda4bcbb253760b8f068d4f.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_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 4944 bytes
SHA-256: 6dd79b167e7c2583ab03e7c3d475229137cb4e60f4c875496a4dfb198f1809f1
font_01_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 12080 bytes
SHA-256: d358d2ca8f6712159ab5caada7052a928ef33a7773fdc93dfd61603ba17f0ae0