Malicious PDF — malware analysis report

Static analysis result for SHA-256 1628c9020e299ae2…

MALICIOUS

PDF

101.9 KB Created: 2021-09-09 23:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 289d70d16a324f8562aa0d8eda35f959 SHA-1: 54ad9447ea7d0d1daad34d627e711dbde3d494b2 SHA-256: 1628c9020e299ae200cb21613565abc18f0dbbfa6086f71472972a454b776b02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to external domains, and one heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external links and the phishing detection suggest the PDF is used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://globalcareerclub.com/FCKeditor/userfiles/file/21109278283.pdf In PDF document text
    • https://ijp2.com/contents/files/fewefokevotitare.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rozelosorizaxerekibe.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/25555718056.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/2334553676.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/papizariwaxalefonemu.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/19727936186.pdfIn PDF document text
    • http://honghuibio.com/d/files/16555208095.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090321264273499.pdfIn PDF document text
    • https://fratellifurloni.it/file/40798404735.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109022214275971.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/38449327339.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/bolitobovogogun.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/darabotupowux.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/bemes.pdfIn PDF document text
    • https://kapefashion.com/files/files/pameveranuganokorozo.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zosowesirosabivonevunedu.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/wumesoselogor.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/mobilufokugob.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/75153106079.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/vokawabagelovoxir.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_022722.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109040901372287.pdfIn PDF document text
    • http://104408017.linker.tw/files/37456055569.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/revilizafutojuwug.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/58158257143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+genetic+algorithms+pdfPDF 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_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 19016 bytes
SHA-256: b0426b52d4d01a3799517c929d67b7b31dfa704d11d622d868b46f6613e41c27
font_01_sfnt_off000158e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E0 11120 bytes
SHA-256: d6e478c67af06a528b7a82a2f0a8ed51a988f3a0fd11377ae8ed6ed2bed1893a
font_02_sfnt_off00017266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1