Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4e008237123e06…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 22:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b73817fdff3b8ba651e6065bb81916fb SHA-1: 7f15f6b15f38694ca48f63e973608a922b104a87 SHA-256: 2d4e008237123e068b15a886535d5d66a52be06211c1e7cf19f1fcb88f86ea57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were extracted, the presence of many unknown URLs suggests a phishing or SEO-based attack pattern. The document body is heavily obfuscated and unreadable, providing no direct clues to the specific lure.

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://erbaytag.com/resimler/files/22715131755.pdf In PDF document text
    • http://denetimmusavirlik.com/userfiles/file/vesopubagibipozenotuj.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/milobida.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/kamilitotis.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wivufopogazewibidukokudex.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/tibipexukinuwo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ce08f0b3---mofijazarelozobudulur.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/juderovomalux.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wuxedufevubikudotafonoge.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/xivomizivabilotog.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/dusilimerutikusag.pdfIn PDF document text
    • http://levotst.com/uploads/files/tafebogujelavobodesu.pdfIn PDF document text
    • https://digireg.it/upload/37595620931.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/51527808314.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/munavejorupivukivufe.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/18921412035.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613f76d27e2fa---71829609847.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/86616835136.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bilagarevabisokamo.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/56858911288.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/47256199612f81130cab1.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/85135527591.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/38264235418.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/remaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sequence+convergence+divergence+calculatorPDF 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 10764 bytes
SHA-256: 716cb358530559f4a097012eb28bd94f46272d60622f7094763d585b6ad520c3
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 18968 bytes
SHA-256: 117a7f95efd8db47059f105fea65e30f33921e40bf7f524d62ba8e0378a31237
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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