Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff1694dcc5ab67e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 09:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bca5b503bdb2f5a2ddcf415f28a021d8 SHA-1: 8763675cf3b3d30299bbc0b8749b593a595862ff SHA-256: fff1694dcc5ab67e259f6138ed8b3e7fa37f88845c76f006bad62eb179b66328
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a potential attempt to distribute malicious content or phish users by hosting numerous PDFs on disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ltpbetel.ro/userfiles/file/60625508628.pdf In PDF document text
    • https://marblo.ph/app/webroot/img/files/rivotes.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/jogosamevowi.pdfIn PDF document text
    • https://ms1oke.com/contents/files/19069295347.pdfIn PDF document text
    • http://billsky.ee/files/file/kogolitafabowonagevedo.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/83890851344.pdfIn PDF document text
    • https://invision.buzyhub.com/files/59498878185.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/3265619653.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630684508.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/19581012259.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/55827216831.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/noverejewo.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/wovusa.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/dotidudajurufo.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/21543695207.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/36711142704.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///vupajijaf.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210905/210905133448709748dmxdnx3vtczf.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/dubod.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/76253808361.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/78669894704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=keyword+permutation+generatorPDF 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_off0000c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 10812 bytes
SHA-256: 1215b3530cf8a6e0fe0409db1374976562f078b0b1c1f075eab60838b022c8ef
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 18704 bytes
SHA-256: be2dcdec3e240391162d1de642d2abc8644f0f06c998a6036bcf4605d60f0d82

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