Malicious PDF — malware analysis report

Static analysis result for SHA-256 788112d95dd23d0a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 21:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6276521952eaa7a208e803d75340868 SHA-1: 552940619f8bf62351007a1893908377bcb9483b SHA-256: 788112d95dd23d0a728d6e60a21059c984ec9249a4aec24214791ab9450fdd36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=smart+launcher+pro PDF link annotation
    • https://isleo.com/i_photos/file/laloxebi.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/pedipewimedovurunas.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/16957040482.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/zojuvo.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/pewuzopasudi.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/70885947936.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/lovegozopibesekukudide.pdfIn PDF document text
    • http://glttek.com/userfiles/file/61028188354.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/17491407955.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316226d3657---76290808790.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_713A3738C2BC5DD7.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/52444454470.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/vofajogakumavurivuwizeku.pdfIn PDF document text
    • https://suruburi.net/mm/file/giviwasebovavudunoki.pdfIn PDF document text
    • http://195exim.com/datas/files/6631418929.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zawifupovadavog.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/dudiburemutunetaxobi.pdfIn PDF document text
    • https://scalping.ir/data/files/file/sonazonapomazixetemare.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/rigofizinomavovupugapusuk.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/tufimazu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/82872436822.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6a6068daa04504deb8a45e8d78f3eea3/zikelavotibotagox.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 17092 bytes
SHA-256: a43b14a99594f393faf1a5a049f3e095bdba51df5661c06775f6f95b7fd7af52
font_01_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 10552 bytes
SHA-256: 5a34d2295dbec2f9e3e1216965f255499807f78aa493856d9a504f7b402d020b

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