Malicious PDF — malware analysis report

Static analysis result for SHA-256 289f59eef2222ff6…

MALICIOUS

PDF

66.5 KB Created: 2021-03-01 02:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fcb40201d4199e880023605604db2f13 SHA-1: a75ef436f046656411b05824d2662b65872d9467 SHA-256: 289f59eef2222ff616017017e28e2cbe60a0c094409b5545a454aa9fa746baeb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this behavior. The ML classifier and ClamAV detection confirm the malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to calorie information, likely serving as a lure to disguise the malicious intent of directing users to external, potentially 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://seumenha.ru/award?keyword=how+many+calories+in+a+maple+frosted+donut PDF link annotation
    • https://paxazojip.weebly.com/uploads/1/3/0/8/130873894/5593166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_6027656eb0641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_601a23396ee88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5ffb8f79b26b2.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/66874767195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_600fff8970965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_601ccadc1d55a.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/5739888.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/hcqPqhB/mopakoguzid.pdfIn PDF document text
    • http://fredo.run/kojovorurulj8j6l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463810/normal_5ffe6e1baafda.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/guwurakuva-vumawibanavew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5ff971f64ad53.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/8719982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapizodipe.myartsonline.com/mini_german_shepherd_puppy_price.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_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 5456 bytes
SHA-256: e7c0f34755840c9550b7c6269cb12ef1f803bc266da1d197eea3fa36c5b6ec59
font_01_sfnt_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 9988 bytes
SHA-256: 3a38f3081061b8c45a868ce40917e13184a364536d0e25c44e1c46dde20807aa

Open this report in the interactive analyzer, or submit your own file for analysis.