Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9390b4e1ed1bf98…

MALICIOUS

PDF

75.9 KB Created: 2021-01-21 02:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 335e7b9f9909cefa10ed916b74455701 SHA-1: 73e77d2532fac453f81d6d65b1a15e41bf341a26 SHA-256: f9390b4e1ed1bf98fd3e0f5153817a083ad33b64bf3eb1bf28db1d105ce9e2b5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Antivirus Bypass

This PDF document functions as a link farm, directing users to various external resources, one of which is explicitly labeled as a lure for cracking Adobe software. The presence of a security bypass heuristic, instructing users to disable antivirus, strongly suggests malicious intent. The ML classifier and ClamAV detection further corroborate its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://traffset.ru/123?utm_term=crack+adobe+2018 PDF link annotation
    • https://cdn.sqhk.co/rularijulen/SxhdNGq/23334408196.pdfIn PDF document text
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/gixegugitofozuzox.pdfIn PDF document text
    • http://subikizivuwen.22web.org/scope_of_work_contractor_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/8E468PB/adorable_pictures_of_baby_yoda.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/1103654.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/8868589.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/sabakazosoba.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/a5baa17.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/wulukivimevulavilu.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/jbiejaf/lomidulumitimuv.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/dunidanafizeri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lusafawapinoxe.rf.gd/96554371075.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/gb_whatsapp_for_iphone_4.pdfIn PDF document text
    • http://limixumijegaf.epizy.com/baofeng_uv-_82_manual_espaol.pdfIn PDF document text
    • http://suvumudupese.epizy.com/kozakidorena.pdfIn PDF document text
    • http://mujunuge.rf.gd/levabipa.pdfIn PDF document text
    • http://dunupepemogakiw.epizy.com/intravenous_immunoglobulin_guidelines.pdfIn PDF document text
    • http://gegenig.epizy.com/11204270935.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/performance_appraisal_sales_personnel.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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 5352 bytes
SHA-256: fde0d7852e349d8cb7f856249a5455e0c15c3a6293145eff02fa2f4e40558102
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 12120 bytes
SHA-256: 69b82c83b2b88b936247b29892f2a7fb19b382c8f628a575cbc8d9aa898f45cc

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