Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1e5b4c9c92708e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 17:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a8fc6077c16790e91ed93c6cb5c4091 SHA-1: 52d4d37c52fae14fb6b6500b20ae60e8bb0dc504 SHA-256: 8e1e5b4c9c92708eda26d25e7b37b331f4b6e0912c9508fa52cab999832b37b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pemaboutiquehotel.com/assets/userfiles/files/biriputakodigukemelexo.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3e127577---mimutodizovo.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/93290779093.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/dowiwase.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/vivanopapubeworigukegadag.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161427e837478a---41782153638.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/12835657516.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/dusobezapumojefuje.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wubewiwaxudajopabuvigine.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/66329929901.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/sorozajaza.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/45057277225.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/75115772214.pdfIn PDF document text
    • http://spiregene.com/image/files/20210911_201815.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/rufamesujufu.pdfIn PDF document text
    • http://ombs.ru/uploads/files/6943988288.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/pidupotatofar.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/41183433114.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/13990328215.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/movurawawerofunodopuka.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/sajitefevedikibexotiju.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/kerujudodo.pdfIn PDF document text
    • http://lagrupacio.cat/file/jubuwudofaxewirudajed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hunter+x+hunter+arc+orderPDF 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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 18468 bytes
SHA-256: 8453c88571b4407d13b165fa73213c8e36b4e6a30b057c661dc9cf6c4784ae05
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 10356 bytes
SHA-256: 52d536cff78ca9c19d443ae35f5f7ea4b1df9225a8c99c6c9d07f92e897d76b1