Malicious PDF — malware analysis report

Static analysis result for SHA-256 1988cc87ade7b956…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 16:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab5968c3c30f1d8ebcaa277d95037efb SHA-1: 15196d69c32b4288280451f42aa6eeb74c414108 SHA-256: 1988cc87ade7b9561bbedb7179f83aef4b987c29468ee1d700fe3e671a406d26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://educasters.co/ckfinder/userfiles/files/28412560801.pdf In PDF document text
    • http://pathtojanna.com/userfiles/files/68843884310.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/42973514747.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/34563373215.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/85940770559.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/degowegomowato.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/45739601023.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d425a049---finufe.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/gafakataxitulurikezupu.pdfIn PDF document text
    • http://kleiberit.ru/files/file/30120074580.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zuzaxowapidulid.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/mivofozobom.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/20135990434.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/7938284964.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/21039932924.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210904114601_gfmgsk.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/funobotipawudapafatal.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/lamojopogebonano.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/bodar.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/71889714660.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61928950847.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/6950428698.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/91258936118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+causes+data+usage+on+verizon+phonesPDF 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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 10964 bytes
SHA-256: 30e204343deb9402ea7e09e437ff1e3c6da70f47517532ee086d9b3bf9ee139c
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 18172 bytes
SHA-256: 5429e711d1c88895a5d9ded52cfc42c5afbff97655d96e1bca4d8ecf474044bd