Malicious PDF — malware analysis report

Static analysis result for SHA-256 5505ad3a0a314067…

MALICIOUS

PDF

79.0 KB Created: 2021-04-20 04:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: be9ec715729a07f2704bc9453157ca55 SHA-1: 549c109e7d3263fdab8dd9fd1953a4e6bdbb22cb SHA-256: 5505ad3a0a314067cbd4db9f4f7ef00f43979d3c1723402279294ee371d01674
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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/strik?utm_term=murray+riding+lawn+mower+parts+for+sale PDF link annotation
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/293781.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/8fdce1.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/2617005.pdfIn PDF document text
    • https://lonapumerupa.weebly.com/uploads/1/3/4/8/134853684/156557224fcd.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/pugosixiroko-xilawariderida.pdfIn PDF document text
    • https://xuwekakef.weebly.com/uploads/1/3/1/8/131856316/mujufofokanasa.pdfIn PDF document text
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/filavekupisazosi.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/pagexo-wifekakezagaviz.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/488233.pdfIn PDF document text
    • https://dekukosozo.weebly.com/uploads/1/3/1/0/131070054/wupijobuvonumo.pdfIn PDF document text
    • https://kukevukoleguko.weebly.com/uploads/1/3/4/2/134265740/6315216.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/vujokos.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/suvofo_modikenev_rerugigi_wemekiziwudekog.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/saroxinuvuzaj-wawiro-gegijokapisug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_491a0d4af9a94445a9483cf688d7af8d.pdf?index=trueIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_2b4311b229034b78b6b61bfc76b4e7a1.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_d602edeceb2f43e4af4978d890bbf3e8.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_ba7f2c77448d43d9a1a75eb0b3108541.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_6a196a6870fc4511b011c533f1b54236.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_fda6c820f4b9411ea41ef25630d0ac80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/vilijirenijusofajobegejif.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_241d08d05b734c6fbf67deda3eeba6d6.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_1a743ad4c7894113bf457e2bdc7a6a48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/is_keto_academy_worth_it.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_731a0ceb2b184038832d00f6d36d06f5.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 5560 bytes
SHA-256: 857f083ab3c6a9c00c3b5abec5b4a7aab06eaf61fc0a781a743a27ecbbdf67b0
font_01_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 10652 bytes
SHA-256: 42d6fb85a9fb89a9493c4e7460048a0abb24c944d7099cac6e7c30420935e713

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