Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fd7c5629d49852…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 02:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e85fd1aa9151c1790006869d6df1bdf5 SHA-1: f127484987c17631a3b1315c01dc98a26ac26769 SHA-256: 17fd7c5629d498527badc26fde51a2bbbba1181881062ed199dea8f264dfd2c9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, designed to trick users into clicking on embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to various domains, suggesting a broad phishing infrastructure, and the document's structure aligns with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 70 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://crysiq.ru/uplcv?utm_term=phrasal+verbs+list+pdf+espa%C3%B1ol
    • http://orvosvalaszto.hu/uploads/files/xikatiwodelikemilugebu.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/64185474893.pdf
    • http://ingmarcofaedi.com/userfiles/files/28931954886.pdf
    • https://nbtele.com/en/cache/fck_files/file/biwixubovalenabiwoxige.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/lijagifogasakavipawana.pdf
    • https://angkaindaman.com/contents/files/litujapewegiwapopiviver.pdf
    • http://barudan.hk/UploadFile/file/20210917215357907.pdf
    • http://dotykbylinky.sk/_subory/subory/7419384589.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e52fb2de10---31931987011.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xazovizirunekukanonul.pdf
    • https://bokaichenyu.com/upload/files/51302217191.pdf
    • http://maurovalleferroarchitetto.eu/userfiles/files/zidutetogegarakar.pdf
    • http://crystaltrade.hu/data/file/funetopazobazefomeriwer.pdf
    • http://360global.ca/userfiles/file/donofikavegivut.pdf
    • https://godahoian.com/app/webroot/upload/files/15266680900.pdf
    • http://ikkosushi.com/uploads/files/kegomesikore.pdf
    • https://rinducm1.com/contents/files/38728245982.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/moxekalemofofizulumenisa.pdf
    • http://cuboni.com/uploadfile/hong202109290635075038.pdf
    • https://ikorti-iao.com/userfiles/files/tiditebadogexubolafejipi.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/zomumasaxawitibek.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614441e869b0e---65823614172.pdf
    • https://pankajplast.com/ckfinder/userfiles/files/koxijugirobesijimiguziw.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/lezowaxofaveluriravutibi.pdf
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/topizokipedudokem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b503.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 16792 bytes
font_01_sfnt_off0000cd1a.bin
40ad406eefc4a482758bd7dfaa98066ebb694d4decb7df877b7efc06caf17fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 10904 bytes
font_02_sfnt_off0000e607.bin
46ce49976f1f7f09394f825cdf37656f86919774f65b904638bbf4bfc6b0a086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 14092 bytes

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