Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84a99cb3422273f…

MALICIOUS

PDF

70.9 KB Created: 2021-02-22 01:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e69e50c47bdc8d39e6bcb465b66ea7fa SHA-1: ee6a6d110040cacd8f1c7b2095cdced28829f364 SHA-256: d84a99cb3422273f88c4d30336312a155289d8e0cfe3bb445944d1a95382aeb2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to create a network of links pointing to various domains, likely for malicious redirection or to inflate search engine rankings. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded URLs serving as the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=sicut%20cervus%20palestrina%20translation PDF link annotation
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/2467919.pdfIn PDF document text
    • https://vupokidenug.weebly.com/uploads/1/3/4/6/134699393/85f4b0977fd80c3.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/4455427.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/dowovuxixej.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/9368029.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/6364db.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/d6bc2c014068.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/pokisobavumunuposuj.pdfIn PDF document text
    • http://vir-tus.com/17127193291asxxu.pdfIn PDF document text
    • http://love-your-lips.online/bbc_literature_companion_class_9_english67ovx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojonuta/mn_dhs_diagnostic_assessment_template.pdfIn PDF document text
    • http://didopip.epizy.com/2007_jeep_grand_cherokee_not_starting_transmission_over_temp.pdfIn PDF document text
    • http://leperipuf.rf.gd/godotemo.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/38445452121.pdfIn PDF document text
    • http://fuvovidesom.epizy.com/accelerated_learning_techniques_colin_rose.pdfIn PDF document text
    • http://maxaluvobewog.epizy.com/wirowadefemiwofupetok.pdfIn PDF document text
    • http://livodubudo.rf.gd/meiosis_webquest_worksheet_answer_key.pdfIn PDF document text
    • http://dezenaxo.rf.gd/informative_presentation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/82411560144.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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 5088 bytes
SHA-256: 464f42084be37a0634a4b424bfa358331624196bd15607a64a2818738005d416
font_01_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 10852 bytes
SHA-256: 7cd048f4bb227f1fb7eab19599315e447c4662777b523fe503b0df5cf1797672

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