Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2ec52ef45b1ff6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 11:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2656b1b0f08f8b3a9f843430582d8f32 SHA-1: 5a4d43ed214447eec8a6d33d3357c76bb4e91add SHA-256: 7f2ec52ef45b1ff67b06e19eca544027ac9305e1c10797896c16b383d40b4620
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of many external links suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

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 https://dermatologie-francophone.com/userfiles/file/jigajibe.pdf In PDF document text
    • http://starfishdowney.com/uploads/files/89655952543.pdfIn PDF document text
    • http://gewald.ru/content/Files/mewag.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/zetixawuze.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/48102362115.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jarebigewefoka.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jisaximepemonoboja.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/zapefonukupemululub.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/gulajizininavopubetedidix.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090813445373499.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440ee87691---virepoxofojiwufomovu.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/baludusevoveliwivakinabi.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/27916826220.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/81768355328.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/74677432244.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/10776923211.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gelivejipafar.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/63913968199.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/95759344347.pdfIn PDF document text
    • https://viettrungson.com/media/Files/nirelikotagarufenikosu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/lizedinudobogufebeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+conjuring+2+full+movie+in+telugu+watch+onlinePDF 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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 11080 bytes
SHA-256: 4ac0fbb115dbfc5456c74d0b3eb467877aa90520aa9e12e07113d5f37adbb3aa
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17780 bytes
SHA-256: b303221b7c5ecc895875886c63764c90c7b40c75d003f553be1a01c556883e4c
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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