Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ea64d94660181f…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 19:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 960b00050602569e7cf1193e0ed6f843 SHA-1: 7d0080d6fd5f1fd34d0b72ac4b1dbffe8ad514c1 SHA-256: f1ea64d94660181fae428d99b990fa88b96e801069aedb07a06a1420d6a02c25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs that redirect to other PDF files, suggesting a multi-stage download or phishing campaign. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/87dd6384c5b0bb9bf12558a4cf8833a7/11389873678.pdf In PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/66605654530.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/vuxezagix.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/1518722023.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/73969147302.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/24789801837.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/39313536554.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/nekezax.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156333103abb---58227123375.pdfIn PDF document text
    • http://linza-market.ru/upload/files/tofajuzosapitometo.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/34697184749.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/77810343649.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/dokejulomopigokubajufe.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gijatomamewip.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/gugenomajobinefagumoro.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/dakuden.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/16114956272.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mezuwowiwomoj.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/85200211943.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/repajivimikedudigelo.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/nelolume.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/59049641384.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/wokobuxurom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fallout+3+patchPDF 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_off0000ae1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1F 10124 bytes
SHA-256: fcf1b08c699239b159ffa2b614c0115ae353afae6a7979bbced738a528184668
font_01_sfnt_off0000c4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E1 15384 bytes
SHA-256: 628722bd756792908ed7e8994ede83283cbaac6ffd7f0fbb2eee9ee443cc9eb1
font_02_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1