Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1fd88957fcfa56…

MALICIOUS

PDF

77.7 KB Created: 2021-03-24 06:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0057ae184168b6a125aeaf0fb2c8d817 SHA-1: d86e9b78d20f982be63e2629bc1128b1913e7972 SHA-256: 9c1fd88957fcfa569b2831855cf631d7f5c25aa54e5856b5e45bd8286c1ffd7d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF's structure and embedded content, though heavily obfuscated, point towards an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://golowaki.ru/award?keyword=dumbbell+and+barbell+exercises+pdf PDF link annotation
    • http://stroymarketmetal.ru/crew_neck_soccer_t-_shirt_mockupxindm.pdfIn PDF document text
    • http://zzzmmmmejjj.space/zurederosddfv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_603a7c3e6b7de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5feda1d556eed.pdfIn PDF document text
    • http://lady-bug.club/shakespearean_sonnet_structurek45fp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_604d1cf98f723.pdfIn PDF document text
    • http://vquest.website/xixobimefepoxivafurafeto691.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/xofebiwudofoxibel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_6000e4412c317.pdfIn PDF document text
    • http://francobusiness.com/84393730628nnsk2.pdfIn PDF document text
    • http://fulifubajamo.mywebcommunity.org/annual_report_of_wipro_2020_17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f730d4-dc0a-4e0c-9793-237fa86c1344/brida_paulo_coelho_analisis_literario.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/boveduposuxuxoleneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f5f5b9-5662-472e-8e21-435c555a9ceb/7912279753.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/xesosikasojamu.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/neon_chrome_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/jubaxafimenasewotiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4094c834-312b-4bfe-9a81-0cc7522ef56c/linafusegogolugotorubi.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_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 5508 bytes
SHA-256: 27e071dc9ebd870cb3c4e7eb3e69f67be985df9c3c4a677e002f302aa0a34f9f
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10892 bytes
SHA-256: 0b3c0956d8a8f9b9369ae2530827b26cad31c5fd5ffe24aec931036c90eb78c6

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