Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aeb2c17ca8eddc…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 01:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c561544c970087df408d8f371a16dd8 SHA-1: 13a05e1c8601247a90a9108c5f45f3afb59d5d2a SHA-256: b1aeb2c17ca8eddc2be85ff77377d938c2901c64c28517fef1dba1e806f90f0b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosts, characteristic of a link farm designed to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect the user to a phishing or malware-hosting site, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://phuongsen.com/img-chamthi/files/rosodikevizenuzam.pdf In PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/404362361.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/pubuzogavitox.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f15979be---gifofaganazinilukilaj.pdfIn PDF document text
    • https://petala.gr/userfiles/file/14951402570.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fesizomurabinav.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/vavudefi.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/19465253465.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/81996148589.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/wikejefusulib.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/tenovabitafedab.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/valegijiw.pdfIn PDF document text
    • http://someteme.com/archivos/_20210912095515.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/wojopamugoweresut.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210910182152.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56520671887.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/75947125041.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/14211461003.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/pajejibaninemefegujexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+can+you+see+who+views+your+instagram+profilePDF 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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 17752 bytes
SHA-256: 54dbcba971a78c49c883b3209811a17f8f30003fa5de764a73685e0d34792935
font_02_sfnt_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 11284 bytes
SHA-256: 6ecbc7a4dbbaf574096d5262c08329bf95892da24e8dba2c6a167c95620e6536

Open this report in the interactive analyzer, or submit your own file for analysis.