Malicious PDF — malware analysis report

Static analysis result for SHA-256 46437ac985f916a9…

MALICIOUS

PDF

80.6 KB Created: 2021-02-22 03:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6c9e8d1359f7ec1270fc4236f4ae9d7d SHA-1: f04892edc0686547b66acf286e01694d30e4aece SHA-256: 46437ac985f916a9ca194f1a19d142bff66b0759d4696b1513f2e2517a057351
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it links to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/strik?utm_term=fdr+four+freedoms+speech+summary', are designed to lead users to harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to disposable hosting and redirectors strongly suggests a phishing or scam attempt.

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=fdr+four+freedoms+speech+summary In PDF document text
    • https://cdn.sqhk.co/xomorenut/FgeY12c/gunexumomo.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ihTJlvu/bolatawosezedalorad.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/bihCjd6/screen_recorder_android_with_headphone_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/kgdhj4h/hitman_2_gold_edition_ps4_gamestop.pdfIn PDF document text
    • http://masalev.ru/700026272339ih98.pdfIn PDF document text
    • https://cdn.sqhk.co/dipopoji/idgMziC/malakexowef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fe5d65613196.pdfIn PDF document text
    • http://detonicro.website/xodep78jxw.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/bgj2luH/53241156385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_6030cd5a07860.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/janivewixukax.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/n8hirXS/didizitekifexesojesokogug.pdfIn PDF document text
    • https://tafugamukizigip.weebly.com/uploads/1/3/0/7/130775106/5647868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_601948242b658.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/farezelof/42833338728.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/the_harlots_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/vogulaneruzurititiz.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_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 5420 bytes
SHA-256: b7a1ae5ac526116fb0c18e760b0dcc1453949636211a4802f994d285c9a52625
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 10792 bytes
SHA-256: 206f9cf4546eb05a2a1233e07a6f6409fef534179d9f1deac50821bb324d87da

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