Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbd0ec233240e4a…

MALICIOUS

PDF

78.4 KB Created: 2021-04-15 20:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b1f03a5d4930a14894ee7ecfdcd7cc43 SHA-1: 3e1238c58a3662e4911730529104ffd9bbb180a3 SHA-256: cdbd0ec233240e4a48cab54ebfc464edc329c91b1d7ff165e18c3b7996520c6a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The primary malicious URL identified is https://xezojetit.ru/strik?utm_term=does+oppo+105+play+4k, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=does+oppo+105+play+4k PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385010/normal_601fe03296b7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_601eecd51e278.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/902a85f398.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/sikatamunofu-finimo-vifum.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/xaxunad-jibepiko.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/xovadiwelukobita.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/bizenivumoku.pdfIn PDF document text
    • https://cdn.sqhk.co/jexumumir/ijhbgcg/dutej.pdfIn PDF document text
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/3602073.pdfIn PDF document text
    • https://mikakegurotitu.weebly.com/uploads/1/3/4/3/134309030/4cae94f4c9.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/b105106d16.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/mjehjOf/casino_cash_claw_machine_near_me.pdfIn PDF document text
    • https://jamelowo.weebly.com/uploads/1/3/1/6/131606155/5390299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_602bd92b8a22a.pdfIn PDF document text
    • https://rewizefugubopu.weebly.com/uploads/1/3/4/2/134266162/rajajalitizagezep.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/4e6a3344204.pdfIn PDF document text
    • https://bixedonaxube.weebly.com/uploads/1/3/4/6/134619794/1056058.pdfIn PDF document text
    • https://lanutitokoxoziv.weebly.com/uploads/1/3/4/0/134096970/fejilugakume-neforigixig.pdfIn PDF document text
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/2e9d0c9fd7101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_7219c33d69334ecfa94312c4bdb42349.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_10029eb54874487385f9dde884cef091.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_8080b4a24f8347f5b58fc261e2f3a533.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_d9e5b72b5579459abbcce7ebb352694b.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_13976d3e99a947bca92aa195bbb97861.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_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 5288 bytes
SHA-256: 3d4abe38a86ec8288040d52d144ba2e385b73c89d6ad5cfd6a80d5091c729158
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 10496 bytes
SHA-256: d7d4b98345f5cdd273955eaf74d38465664298505f1e374e693fae5970ca9159