Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bede9f8b2ee2117…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 19:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3138fe4917557d02eac1f152183a38d SHA-1: 00461050d3a5b0e9c1528b59b198875bae20c6ad SHA-256: 3bede9f8b2ee2117c3d4f7303cbd729231e6c6a0de4b862da6a4ab3f498558ba
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bakwanudang.com/contents/files/56677051333.pdf In PDF document text
    • http://incomingmakedonia.com/files/files/59133175022.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/zuganoti.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3956_20210902035817.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/vanuzilesas.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/vesefedaterodofufigi.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/bimisalatid.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb51b29c9---61937867866.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/revulanubo.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/68196220359.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/doxizodosumidalikufepi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/mesowerenugap.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/pifemopisizejuvuwabuv.pdfIn PDF document text
    • http://snsi.jp/image/news_file/buriw.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/14402132482.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/85191167961.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/27161704773.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/38134641039.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/gapodaripedebekipajevupa.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/zogodefoluxifugososapov.pdfIn PDF document text
    • http://schokofontaenen.de/idata/49176944969.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fupubem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mi+note+11+pro+price+in+india+2020PDF 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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 10580 bytes
SHA-256: bc7eb4452f4d57d054fcf63b3da950c967e4ecc0ed3b802301f1e6b7882d1929
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 18648 bytes
SHA-256: c088eae556abb1f928d0ced426ca993f52bd0d19bcccaf4ea0861786a7c94cca

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