Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a57f870bd869a3…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 14:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6da189e0a9f37181446f1184b63a8074 SHA-1: 77dcff377a8e408b115258261427fa5083576c59 SHA-256: e9a57f870bd869a37e1e764433077951ea018f87744e6262ae8312b2e9dc85b5
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, noting the small PDF size and non-clustered link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful sites, aligning with common phishing and malware distribution tactics.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=furiously+happy+google+books PDF link annotation
    • http://x-bionic.shop/49154985191yql67.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/10625.pdfIn PDF document text
    • http://artelamp.store/defilatwnw2x.pdfIn PDF document text
    • http://repair-planshetov.ru/70459453346uf4bg.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/digH7jh/didigilutuvesage.pdfIn PDF document text
    • http://perevod-card2card24.site/asus_android_driver_for_windows0mwm3.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/ncgd3ia/83938771158.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/a5xxjgd/63243350642.pdfIn PDF document text
    • http://openplafond.xyz/soft_callus_formationcwddo.pdfIn PDF document text
    • http://izzzaaa.space/74293171707lt9qp.pdfIn PDF document text
    • http://carluxepaint.site/beerbongs_and_bentleys_torrent92lw4.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/jojitagifuva/causes_of_poverty_in_nigeria.pdfIn PDF document text
    • http://nozefemalevarug.rf.gd/17514663061.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_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 5344 bytes
SHA-256: 3605968ea62b7222210c31ad4a536bbfebb6d267127748aea11294238a154000
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10984 bytes
SHA-256: 3dfa959738ca7e91a6f786a745cfe6902da2b3dc2f2599e1644d4033d0a24150

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