Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc745a7615c53cfc…

MALICIOUS

PDF

81.5 KB Created: 2021-02-18 23:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ba5f8f7bee48b79a97ae1ba1cf007d66 SHA-1: d5e28ee3ed44be90774e90a529bbc94a5f3e8c1b SHA-256: dc745a7615c53cfc9dfc079e853a4185e39f6f2280cc21746a599034e164d326
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to firmware and applications, potentially used as a lure.

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://bologen.ru/123?utm_term=asus+rt-ac66r+merlin+firmware PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ff2b044520a6.pdfIn PDF document text
    • http://3bureaureport.info/47460471127rwpyg.pdfIn PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/boxatelukovasusiju.pdfIn PDF document text
    • https://gizizajavime.weebly.com/uploads/1/3/2/6/132695742/wixutuso_biboduxivilaxik_fodetusidanuxo_dojasedapesulaj.pdfIn PDF document text
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/8474405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380871/normal_5ffad8b91f634.pdfIn PDF document text
    • http://fruits-summer.fun/castle_story_forum_forest_wispl0b4w.pdfIn PDF document text
    • http://lnstagram-helping.live/list_opposite_words_englishg75cy.pdfIn PDF document text
    • http://maxist.ru/mexapm2dc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fcccca725351.pdfIn PDF document text
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/1de97bc7.pdfIn PDF document text
    • https://wetuwene.weebly.com/uploads/1/3/5/4/135400298/1177188.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/purawuma/49587831702.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/xuvuveputizutogugigelofop.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/anecdotes_in_american_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/8674952027.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 5296 bytes
SHA-256: fcab53ecab9db65913b3bdfb3d0efb66c4d3ed195bf3b6317de54296ee2a75c0
font_01_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 10540 bytes
SHA-256: 4eb3448c9e393aa961b840c5739e88a26f99722c117fa8828cc62f96b2bd325b
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16448 bytes
SHA-256: 3f7f6beb0f5865f83039c8434023d34048916fbab515aea8bfee4d6c7e3f3101

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