Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc94353cf4934042…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 19:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b122682b8aa87f4aab3d6ca93b4b6258 SHA-1: c3f2615aacf0833ae9bac4089a1822204f57761b SHA-256: bc94353cf4934042814cc249346897088fc248b4d170c99731f4ae70ecf231c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm or a distribution point for further malicious content. The PDF structure and embedded links are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://dmhu.eu/uploads/uplib/file/gejanemebajepuwuf.pdf In PDF document text
    • http://zamdq.com/filespath/files/20210912080213.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/suviratewiruvofuviz.pdfIn PDF document text
    • http://ladna.pl/user_images/file/32516558143.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/72973483600.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/52629541756.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/19460245976133bf1553843.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/baviwofomuputetabu.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/36602774552.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3553b4bf3---titalano.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/50347913537.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/26431156216.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/wijefenizonemenoguto.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/bawifegi.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/vezevofupinaxuxuwif.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xixaxe.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/25186273985.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/megekidevejuz.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/rupaxigilasanuxuj.pdfIn PDF document text
    • http://vejwun.cz/images/fozuno.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vk0dm73usk1puo9ugjfbpmvrum/lufubuwuxufa.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/67411949106.pdfIn PDF document text
    • http://chulintemple.house-well.com/CKEdit/upload/files/jaxutenalelodesede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+coop+rpgPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10064 bytes
SHA-256: cc1f4cc00e4d70c4e4ba7fa53acf6694a4877dd5d027434b49d54ab92d684505
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 21276 bytes
SHA-256: 3682c5fd96f26e56159c9bdd82d7ee2e8452984178468b5f61e4fac9ac975913

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