Malicious PDF — malware analysis report

Static analysis result for SHA-256 845bccb96f9c366d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 09:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 228f5527767521426b2df56c34ccc752 SHA-1: 8ec49a74b89ba4f6b075ef8551a82a60c0f8f691 SHA-256: 845bccb96f9c366d30822a97be417af97b6af011f7c1c99bcbd7c435a52c6e39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The presence of embedded URLs indicates an attempt to direct the user to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://archism.ru/uplcv?utm_term=how+do+i+transfer+photos+from+android+to+ipad PDF link annotation
    • http://vocal.bpv.su/content/files/files/63809771712.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/xiwixovozegovodidut.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d36e69f6fa522be6b98f44f343f8f1/kisisegojijoxu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/juxuv.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/57962433568.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/gidajekemovipinajadofegul.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/zakanovusota.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109172109304496.pdfIn PDF document text
    • http://c-amc.com/upload/files/niwofugukagibewapenib.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/6990735148.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/majufikaguwukoxukegoreto.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/15998848132.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/sukoxipanorunuguvebeve.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335da2159b5---75446148303.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/8580929954.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109032211502744.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/bitokun.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/8645647136.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/weredewegudera.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/35161170141.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/wijugirisuwovefojebivevu.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/bisojolupobativerob.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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 10792 bytes
SHA-256: 604487be3a498200f08e06729bc8b64ed0eb36f433747cbdd4abe5bf9f8444eb
font_01_sfnt_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 15668 bytes
SHA-256: e9478aa2caecc3fb9783aa0620daf51a78ea40a16a392266089a787f6bde8d6a