Malicious PDF — malware analysis report

Static analysis result for SHA-256 4311b6272bfaac20…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 01:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1fe58a284995a6ec2bf00eb47d8cfd9c SHA-1: 892a603f44bfbb8f84aa741998392ed9354b142e SHA-256: 4311b6272bfaac2031d27666fd9fa21864cad55fb06ee6b0b3845a0ef123c5a2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 67 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 https://smidgel.ru/uplcv?utm_term=dream+league+soccer+apk+hack+download PDF link annotation
    • http://spartapr.com/images/upload/file/58003444135.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72514002a---30216684658.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/samewuzavatogiruwija.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/paxinesuwo.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bavosuvusujukimu.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/12886924264.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/46098517242.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/44981224541.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/34362003901.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/45733032441.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/44707623049.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/33037220735.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/10850670013.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/forotodoripize.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/51110570734.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/33822899751.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pofifovitoz.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/77427134943.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/jipuri.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/tevotoromam.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_off0000acb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB1 14216 bytes
SHA-256: df169aedc31bacb45053a1d64e1ae19215f3d6152fe92e5c394fd1b20ba8625d
font_01_sfnt_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 11048 bytes
SHA-256: 293d70f0d3fa435889a61ed1be9b1eb3a342d274ce7d79c7ee782e3240a4f5ea
font_02_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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