Malicious PDF — malware analysis report

Static analysis result for SHA-256 56578fe4114b8daa…

MALICIOUS

PDF

86.1 KB Created: 2021-10-06 01:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb13d4ad5a96df68d412a8e98b0312df SHA-1: f3bf6bad671fc1477b66f862c7a3868b7b4bf6ac SHA-256: 56578fe4114b8daa286030a4af577ac36bd4f9307542f48dee3ed52f0a91fd10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to obscure malicious destinations. The presence of a 'download button' heuristic further suggests a lure for users to click on these links, likely leading to malware download or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0d4a494c23ef6868a5f17d8d77ff3fd4/36641980968.pdf In PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/borakuviwamomerexezib.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/gofoxorunepilofoli.pdfIn PDF document text
    • https://upaspor.com/resimler/files/fagaferemipobitegufaves.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/simonazusilevolizibup.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/80463047125.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/sotefowubipegapagebojadav.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/7183682173.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/69054912359.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66048604830.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9f1424035886c5e74ba4717d253b26e2/1411994734.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kufodapagobitoropujefije.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/zixivakafegamobozikaxix.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/pumijavadejupedilowe.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/xotuvebadulor.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/dugomeno.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021981215143339.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210923035158.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/17241693871.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/zuluwefoviru.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/dojotevowapof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manual+staad+pro+v8iPDF 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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 21512 bytes
SHA-256: c86a4b6000045466d875d286ed2d70998acdc3355495540b83a3fa69dced3b21
font_01_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 10620 bytes
SHA-256: c9e7f0de8214ceb6e11bc07e16cac5303e71554260b2298aff9366ca1aa85a1a
font_02_sfnt_off000131a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1