Malicious PDF — malware analysis report

Static analysis result for SHA-256 292caa543869d2c6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 17:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 238a7faa97f87f7a38f80fb3fbe42cba SHA-1: a2888771c033f448617e17ee0f90b89ee09f1e9a SHA-256: 292caa543869d2c62672835b22716a13bacc28368ff1f4e77782817b5661beaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=send+with+effect+android PDF link annotation
    • https://yenicekentkaplicasi.com/userfiles/file/95624423715.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/28583246087.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa67919014452a41c9d5277eaa286ecd/99665600323.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0912/4ea05c6d4c8d6f6e829c8f88f4e59cef.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/68604923070.pdfIn PDF document text
    • http://poorclarescork.ie/images/35978158407.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/46647785337.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/41238218056.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/tafixudefazul.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufowijokasof.pdfIn PDF document text
    • http://newcityhk.com/userfiles/fixerolosu.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/jejurumuzezoxeba.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0430c4df---93603676807.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/jidezerabo.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/36548405922.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/83914848226.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/62668831674.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/misajuwobatimalovusebawon.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/85586694306.pdfIn PDF document text
    • http://skene.es/userfiles/file/53791829571.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/38846332789.pdfIn PDF document text
    • https://cooperspick.com/files/jesiwatebono.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pikewugi.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_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10520 bytes
SHA-256: bfbdec4fbfe11f9bdb290cf97a91498f4fd8180d2f300e70e9ae38a67fa234d5
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 19088 bytes
SHA-256: ef0e36fbe01390c408044c95def92b366deffe0ca113cc28cb062cfb74aff789

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