Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a49e7da2b5b696f…

MALICIOUS

PDF

78.8 KB Created: 2021-01-26 17:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34e5935d33cb410cf8f718f6997a0997 SHA-1: 8a50d53d868b499d3713e4fce99dcff1836d9e28 SHA-256: 7a49e7da2b5b696f5435ebdbb91ef741337cee7ac8c58a121cee84d9a395a9b0
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 0.9998

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://crophysi.ru/aws?utm_term=good+platformer+level+design PDF link annotation
    • https://cdn.sqhk.co/zekuxemelop/jJBgggg/artificial_intelligence_movies_2020.pdfIn PDF document text
    • http://easylearning.space/tigijuxaw6igu9.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/wje4u6e/aesthetic_wallpaper_iphone_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5fea02d081046.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/MVjfxpK/friendly_ig_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_600a3e6994bee.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/CSgfjax/11043750350.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/5Mdghgh/14630815038.pdfIn PDF document text
    • http://sacredname.ru/arti_mimpi_hamil_di_luar_nikah_dan_keguguranj4d2q.pdfIn PDF document text
    • http://tersq.fun/mod_minecraft_sans_virus3dsya.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/utEhgxh/remevemezemelifu.pdfIn PDF document text
    • https://cdn.sqhk.co/kukojuvata/NPWhIgh/ouroboros_tattoo_wrist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5fdbdfa636fba.pdfIn PDF document text
    • http://secureappeal.com/21623965852mwker.pdfIn PDF document text
    • http://ejqy.com/91341537253wi575.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/hgjifgc/elifoot_19_pro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekidezeze.epizy.com/javisifiwomejerejafiw.pdfIn PDF document text
    • http://vatilibudavelit.rf.gd/73582216147.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_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 5452 bytes
SHA-256: 3028fa6de54781a67a668d4a6d010aeebb88dd2d239b5dc2b48b67eab3c5bf24
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 11752 bytes
SHA-256: 9e38bc79bff933b184efdab0440717733cb18f25178c1fedfb1f3e8779d3681e

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