Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8a4b346017091c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 03:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4c02b5a41e2f2e9929836848d3b3e227 SHA-1: bbb111b6840583ea9cebab31150cb5bce81856a5 SHA-256: fb8a4b346017091c431a079be910601c8f58289afa8270d1c4f7c2bf3237bec4
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. The primary heuristic firings indicate a large number of external links, many hosted on disposable domains, suggesting a potential SEO manipulation scheme or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of many external links are indicative of a phishing or malware distribution attempt.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/award?keyword=nicomachean+ethics+book+1+chapter+7+pdf PDF link annotation
    • http://sabumow.mygamesonline.org/ripet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_601a2b2b8874f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fde760675afb.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/1vhbGE7/dead_shooting_target_zombie_shooting_games_free.pdfIn PDF document text
    • https://kogafisefog.weebly.com/uploads/1/3/1/4/131438876/vozus_gogizarexul_divos.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/2519211.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/eP5jfjb/13576507021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60313ff18cc2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_5fd37c18593b6.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/how_to_connect_sony_ht-ct780_to_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/i80ag0w/atf_box_driver.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/d1f26.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/i1igjfS/volcano_island_tropic_paradise_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_1cc2b38a539b451d8258af91746fee3b.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_7e1c15ff7c284229aed8ae8341931bcc.pdf?index=trueIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/ziwivufuwuravuz.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_655236ae2b1c4608963228ea03dfaead.pdf?index=trueIn 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_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 5668 bytes
SHA-256: 1f917bade649fec76970a1c0f939b5164122948459b4fac6d1f03cff1090f559
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10636 bytes
SHA-256: d6f1a69cb97b15deea945a8f1cb02e0bd2b1174e4f2f5e6d77f2d6fa3035b518

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