Malicious PDF — malware analysis report

Static analysis result for SHA-256 c733b7c27f0c1c50…

MALICIOUS

PDF

91.4 KB Created: 2021-03-17 18:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6a0c7b8c78e5725ef60b10f96c64f2d SHA-1: 616e17a0ca40aaa5838f9d1215c4676e527bbb48 SHA-256: c733b7c27f0c1c506b6d034a88c6934c83cf55070824e300a275e6fd88072bc3
234 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, presenting itself as either an invoice or a required browser update to trick users into clicking embedded links. The document contains a large number of external links, many hosted on disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/strik?utm_term=haier+portable+air+conditioner+drain+hose+size PDF link annotation
    • https://cdn.sqhk.co/gorubabor/as3cmB5/89247770109.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/goniguga_jewadotofofulox_givuzanalizi_betuzoguvip.pdfIn PDF document text
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/degemus-petukazunorug.pdfIn PDF document text
    • http://twoup-viktoria.online/minecraft_bedwars_map_download_1._16._12vrru.pdfIn PDF document text
    • https://cdn.sqhk.co/gubuvojubu/574hcln/78224797592.pdfIn PDF document text
    • https://tebuzemuba.weebly.com/uploads/1/3/4/0/134042716/xafegilipirasa_xebunewagaxe_zutevatit_pixovozezix.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/gate_2020_chemistry_syllabus.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/22658f6929.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/lenored.pdfIn PDF document text
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/9f440cc7fc9cf.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/punopilona.pdfIn PDF document text
    • https://webenewosa.weebly.com/uploads/1/3/1/4/131409170/f25154373db6a.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/dpjhQgj/63718293889.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/pBfhdzf/math_magic_tricks_bangla.pdfIn PDF document text
    • https://monogelifanalo.weebly.com/uploads/1/3/5/3/135387447/xasudokutib.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/figuki.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/637230ac1cdf.pdfIn PDF document text
    • https://rujemezemomiwo.weebly.com/uploads/1/3/0/9/130969750/xegifinikeb_moginolov.pdfIn PDF document text
    • http://hookup157.site/remix_os_player_download_official_site075q2.pdfIn PDF document text
    • https://tenewokuge.weebly.com/uploads/1/3/1/3/131379402/5343223.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/oNhjid4/grand_furniture_telephone_number.pdfIn PDF document text
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/wetujofadivis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dipagepe.atwebpages.com/52530374358.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 5100 bytes
SHA-256: 2fc0ce5f8760154ce66703e5d4bdc6867992fec44318dba563ea9e4840d7870a
font_01_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_02_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 11100 bytes
SHA-256: 3264cb54e76140a2051ce2beab0cb4746a70b764b53048d785a0779b7bf6aa82
font_03_sfnt_off00014f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333