Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ae7a4337117a2b…

MALICIOUS

PDF

70.8 KB Created: 2021-03-02 22:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 72adf690a66dc3912bc35100030ad668 SHA-1: 08f3fb6c0f37ed58c23bc357f2b5edeae6a11ea3 SHA-256: b4ae7a4337117a2b39f1f4216778b87b3769aff74fad2b293a73a6ff89c9bf25
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/wb?keyword=why%20is%20my%20freezer%20working%20but%20not%20the%20refrigerator PDF link annotation
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/26eac169f4.pdfIn PDF document text
    • http://presalle.xyz/99405329719c0bw0.pdfIn PDF document text
    • http://souve.me/legend_of_the_sword_in_the_stone_lyrics91bb6.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/muwepipaxonexijoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/2gemgc6/office_story_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/ajgddO4/56335662492.pdfIn PDF document text
    • http://sikepelisu.22web.org/canvas_business_model_generation.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/8c7d96.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/tenixezi.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/pukiza/sezonebinaz.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/ranged_fighter_5e_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/42819377015.pdfIn PDF document text
    • http://zasegusof.epizy.com/47559751427.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/anheuser_busch_culture_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/kidumiro.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/halloween_coloring_sheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/pipaluzimisoka.pdfIn PDF document text
    • http://wujewepal.epizy.com/9531277462.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 5612 bytes
SHA-256: 434ff0699007c2e0bd0b1643c412bda58aec5201544c5827130b3ac88a97a86b
font_01_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 10384 bytes
SHA-256: 089e58af9ef9d040f2a85f69c004d71384054c4973bccc08681863657d978b11

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