Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd93a321325f147b…

MALICIOUS

PDF

74.6 KB Created: 2021-03-01 18:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28b0970141a4b7725d1224d4041a463a SHA-1: 9eedddb3d65868dd6aac4f80b0ce2a22c13bf46e SHA-256: fd93a321325f147b0216f2700558c0da005c05976228b9da7855c33a40c324ed
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a URL designed to lure users with cracked software. The document body, though heavily obfuscated, contains text related to 'Adobe Acrobat X Pro serial number crack free download', reinforcing the phishing lure. The presence of numerous embedded links, many pointing to S3 buckets, suggests an attempt to create a link farm for SEO poisoning, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=adobe+acrobat+x+pro+serial+number+crack+free+download In PDF document text
    • http://fit-italy.space/50722764077vcxl9.pdfIn PDF document text
    • http://alteramaks.world/552395466891d0l7.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/lofodesabum-vevomusokegi-tokanugaver.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/7607100647.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/63348383110.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/wotuze.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/73004299354.pdfIn PDF document text
    • https://puvugopusu.weebly.com/uploads/1/3/2/7/132711965/5424a.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/betopis.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/tolivajupeku/jatimojomafi.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/40948125263.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/76026665096.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/brahmanbaria_weather_report.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/86681787543.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/tubafusexepo.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/terra_mystica_chaos_magicians_stronghold.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/jubijejo.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/rubutigogifijafenonuji.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/agneepath_picture_film.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/chrysler_voyager_2008_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/car_bill_of_sale_oregon_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/xabizobawujoroxu.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 5652 bytes
SHA-256: 8c6047f5f8381e38afdf2cf89c1d2f1ea15ac7acf5f9bef49e931b715e565686
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 11248 bytes
SHA-256: 65696552d6aa9fd8e34852e9fc125843e0352a2b45531a06bf79e7594cb34f5f

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