Malicious PDF — malware analysis report

Static analysis result for SHA-256 157765626eb97d3e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 20:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4db347c96f7ea5440d54a89308f89ea SHA-1: 7f9ed65ab1fe6f524bf3373bfb62e10835feda82 SHA-256: 157765626eb97d3e16a13d46c198776fb1cbf2b8e88c18c01cb7e86ec66ef5f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to PDF files on disposable domains, suggests a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the sample as a link farm on disposable hosting, reinforcing the malicious intent.

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 http://radio-salsa.com/php/rs/filesupload/file/torakej.pdf In PDF document text
    • http://aaykpn.com/uploads/editor/files/46078085254.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/56012823039.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/lapibubozofi.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/raturufex.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/87205418083.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/xizajafekademodetafuw.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/japulipaki.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210906_A9E9A5F48DE164DD.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319d507ab51---93539725472.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161388eb25aef8---63912821276.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/47816013365.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/95314737692.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/sagijimubefuj.pdfIn PDF document text
    • http://biosite.ru/images/news/file/51601307319.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/sawirelatusarufurogig.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/28347835018.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/47907962059.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/68240326966.pdfIn PDF document text
    • http://synhbio.com/upload/files/68476225776.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/27267152203.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/48712540094.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/ponulamerej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=easy+cash+reward+apkPDF 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 19148 bytes
SHA-256: 33d0848f5c72a1469a0378f93c30e0ddf86e97cd22f2fcc20862d1de36a661d2
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 10428 bytes
SHA-256: ef90690fcd8b6d752e40fdaac4b5349894ef01d3bdd256a22c9c7c725f92b93d
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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