Malicious PDF — malware analysis report

Static analysis result for SHA-256 77200d1015b735a5…

MALICIOUS

PDF

73.8 KB Created: 2021-02-27 19:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fe52bd1397f77308807d0fbf17184ec7 SHA-1: eb9cb533cff12499bfe6d1199f929dd4cdcb629c SHA-256: 77200d1015b735a53bf4ad3bd32bd6ff4b09307e3f3b24af5725cecf6f6eeb60
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains text related to 'bill gates 11 rules of life' and references wkhtmltopdf, suggesting a lure to disguise malicious links. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

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
  • 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://resalured.ru/123?utm_term=name+two+of+bill+gates+11+rules+of+life PDF link annotation
    • https://sodolujakuxef.weebly.com/uploads/1/3/1/3/131398606/dujud-rewaxe-zijadutagi-gimevo.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/dovivixoxajakenuzitagala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405181/normal_5fde6bc680308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_600a68ee3baa9.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/tenuzawusopebuledefuli.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/jopakefiwabudepebip.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/tekixoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408991/normal_60033f27a3b00.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/ziwizojegapijam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fde868cd32f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofesosozofoso.epizy.com/alzheimer_s_society_factsheet_484.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/an_ember_in_the_ashes_google_books.pdfIn PDF document text
    • http://kesitebogi.epizy.com/nec_national_electrical_code_nfpa_70.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/bomomarepiw.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/fekanisuwuvixuzubokej.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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 5340 bytes
SHA-256: 239fe9bdb9be2d332f5cc57091582145f2c6901b3960b3638127ab128854750b
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10896 bytes
SHA-256: 1199f176f753b033369a9260de512916f95ce323f9327bb5df860b422883d330

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