Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7784c3788ba0f82…

MALICIOUS

PDF

77.5 KB Created: 2021-02-10 02:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d5ebf3f189edff53ffade516acf0eaf8 SHA-1: 62c703bfabfe13abd52ccba42a74fc8dde1c9e96 SHA-256: c7784c3788ba0f82dd178277f1d4e91fb3e65deb87818d459a4415167b0c97ba
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://yafferge.ru/123?utm_term=dresser+rand+reciprocating+compressor+manual', is the primary indicator of malicious intent. While no scripts were extracted, the PDF structure and the malicious URL strongly suggest a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=dresser+rand+reciprocating+compressor+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_60135e957e7c4.pdfIn PDF document text
    • http://herss.space/cat_wart_removal5hofk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5fdeaf59ac0e3.pdfIn PDF document text
    • http://zatoboyvibor.fun/lettering_guide_tooll92vz.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/kujapomib/bull_run_fever_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/counter_strike_global_offensive_latest_patch.pdfIn PDF document text
    • http://jogufek.epizy.com/1672151544.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/82249458432.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/19816500044.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/fumoworiz.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/astounding_science_fiction_magazine.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/battle_trip_ep_78_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/29473581999.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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 5392 bytes
SHA-256: 3d1d0e35aef0670826d5b542ef7f93c30af2021a6cadab3f72a48d72325caf9d
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 10848 bytes
SHA-256: 115283c3847a51f388f49d4b55609837aa0351fb1d3dce079f47284b2f75d962

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