Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef69efdb80b9a544…

MALICIOUS

PDF

78.7 KB Created: 2021-01-10 02:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1480836cea1c0d389c7af6bdfdde052a SHA-1: e85d48a1fec58e5fae864b7135552f6bd955d4c7 SHA-256: ef69efdb80b9a54480b48cdd5652be7c38a08c94221f2e4dcbe8c1733679bfc7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9995

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://traffnew.ru/123?utm_term=free+sniping+games+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f8727d0722fe.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/satiruxisa.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/2166192.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/qheEJgi/7390658144.pdfIn PDF document text
    • https://luxapojago.weebly.com/uploads/1/3/4/3/134327771/e0f5a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fdebcc6657a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387810/normal_5ff160056cb56.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/gfgilxL/mipezazumanutova.pdfIn PDF document text
    • https://site-1168118.mozfiles.com/files/1168118/38144257953.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/54865925835.pdfIn PDF document text
    • https://site-1174122.mozfiles.com/files/1174122/sports_live_tv_app_for_android.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/buviz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 5352 bytes
SHA-256: fd9aa2764df43d3f07af055c796b52e86a88c8a6bda345372d532a0eb4c0f8cc
font_01_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 10780 bytes
SHA-256: 1795b2a1c657099b505a5742167c57ad65ed03e8f2306819e6c8810d119f50f2
font_02_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 17256 bytes
SHA-256: 84fe8aa0696e3a95e3af606f6cc09fed54af68da35dc0063ae755ecf89cc88be
font_03_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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