Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca88f33f9c50ace0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 07:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b372c3dabeb2a52c4c68682fa88dfaef SHA-1: a53a879737fef83077cc6f143a02a46067bfe195 SHA-256: ca88f33f9c50ace06c5437584182ccadbce607ee017b735e39209532682513fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable domains. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to lure users to external, potentially malicious, sites. The presence of many links on different domains points towards a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vespaclubcagliari.com/userfiles/file/36668173839.pdf In PDF document text
    • https://apelhijau.com/contents/files/47791165183.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/97774907934.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kowazugokevizonewaxodup.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/veluzugatojis.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150fe0936d64---notogoren.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/segorilulemizidudovurewe.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/lewojinilelizofibepi.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/tulalupe.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/25451403907.pdfIn PDF document text
    • http://vladekoservis.ru/files/mazekaxururesewovajeledif.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/nuxabolobapujaj.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/78118855695.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/18341496237.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/taruseg.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/boletewegoludabikabasi.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/68791443113.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/42822200446.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/77150418503.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210917044857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rate+of+change+of+kinetic+energyPDF 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_off0000ad95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 16716 bytes
SHA-256: fea1dcb70ca3c31a137e410bd3fe1dbc97770f71f8387ef66f11885855a40be0
font_02_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10652 bytes
SHA-256: 3802199a6c29f95ff70a2fe82c1bc5b88d54a6306b624abb6a3bdaa7b757ec07

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