Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a912be519f4804…

MALICIOUS

PDF

80.2 KB Created: 2021-05-02 20:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fa40c28d16268a13a2686914105b3a21 SHA-1: c82ba0e2d4f837def5347bf3a010c6296f5d5a4a SHA-256: c4a912be519f480451a01fc24278e79f5961b730f0d7a7a88038d6695326aa40
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/strik?utm_term=big+jambox+software+update+download PDF link annotation
    • http://kupiokno.su/bupixuruw76rc.pdfIn PDF document text
    • http://finansi-7.online/antoine_equation_constantsr05gd.pdfIn PDF document text
    • http://centerverifybadge.com/607453441484xozr.pdfIn PDF document text
    • http://sewonmedix.ru/how_do_you_reset_a_samsung_refrigerator_with_twin_cooling5b4de.pdfIn PDF document text
    • http://gebajajax.22web.org/nogozujami.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/zovezitogg8lyg.pdfIn PDF document text
    • http://reliables.ru/dozesimokitis1x3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fdc4feb5123e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_6012b28101397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenamumiv.rf.gd/27297327784.pdfIn PDF document text
    • http://junamatodomuwip.rf.gd/lezibulogafisalar.pdfIn PDF document text
    • http://sovizaz.epizy.com/recyclerview_adapter_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/bemupojovorifip.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/why_is_unconditional_positive_regard_important_in_counselling.pdfIn PDF document text
    • http://bupojawepuda.epizy.com/problems_translation_arabic_into_english.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/52982799867.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/31340841805.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 5784 bytes
SHA-256: c80d27acbefb78657a8aac597560e9311cf34f3cccda6964ccccf6255a266766
font_01_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 10556 bytes
SHA-256: 64763388d2ed2dad9391ee5992c3e2c45b3396c1813b9fc7cf0573e1b9b53877

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