Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e551e7dee5b861…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 04:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e902083105859f68ba7a32573d1aed7 SHA-1: a026094d7943a21fdc9c18bbfad6a304518eebfb SHA-256: 77e551e7dee5b861b0617b1f9512cb1496e69da8edfa25a986a641846d7c6073
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing or distributing malware. It contains numerous links to various domains, forming a link farm, and redirects to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://dar-tom.pl/userfiles/file/lapos.pdf In PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/77999821307.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/18543945681.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/vowagojaladifemowuvapade.pdfIn PDF document text
    • http://cobweb.janci.net/upload/files/82086464115.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/86333413439.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/robototabifidujaroremu.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/xagon.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/32162663748.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/28556602141.pdfIn PDF document text
    • https://activepymes.com/pub/file/nadufofanumagadesalus.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xekudilizolafajorada.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/fovesuzusupeku.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///23909819319.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/xafiralen.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/82550540496.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/14987990377.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/87935762723.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b2d5f2cb7---67380829654.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/woxitimusugokomumidenudav.pdfIn PDF document text
    • https://loyd.rs/images/file/33594625069.pdfIn PDF document text
    • http://bienbao.net/uploads/files/buwelimifabid.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/45784848552.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/77346653045.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/felelimewufegux.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/93613936419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fortnite+mobile+phones+supportedPDF link annotation
    • 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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 10712 bytes
SHA-256: 997710a94c12ab13c1701f2d40b74b80a2136bcce61e3fb54525571a2dc02f9f
font_01_sfnt_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 14140 bytes
SHA-256: 284311a4010143d872e4dee7f8af4903d122b02cd10f5c898b80074f7131d0ed
font_02_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1