Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac44659086aa35f3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 00:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c949f9604b8fe8ec5ed83bfb1c886aa9 SHA-1: 3330fe2789ec2ec16d24bdd5eca02a8231808be8 SHA-256: ac44659086aa35f32353b8cb3d8fa6fe1aaae5295980eb02ca71c21776e11cbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically flags it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maihome.hu/admin1/file/16000532067.pdf In PDF document text
    • http://heimundsicherheit.de/userfiles/file/farogidiparenifo.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/59641223766.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/wofamawexamapatafuxuwos.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zaraguvusorefepifoko.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/99431391424.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/14884707132.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/78571314926.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/29483646848.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xesarutemofedimebaxuj.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/37936957900.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/43541409322.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/mabujuvuma.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/29165693147.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/xujedofiweturunuwoduxuj.pdfIn PDF document text
    • http://secretinvitation.net/images/files/31264901818.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/kotetodekikikakulaxodelat.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/60084798099.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/vejanenar.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/gafefagebufi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210902185501_412851214.pdfIn PDF document text
    • http://519pf.com/userfiles/files/45803192251.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vejuwu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16138e50b659e3---konanifofopavapuvilevapeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=after+watch+online+123PDF 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 17876 bytes
SHA-256: 75890eead4cf6e1983df363fa4738ff689b09b95b7faacde9c2160e11d327c33
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10676 bytes
SHA-256: c5bd2e5de42e388bf06818baa5f976594d365a7a4fa0851e7109a58cbdff1771
font_02_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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