Malicious PDF — malware analysis report

Static analysis result for SHA-256 776adc3c51e13f40…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 08:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 201211c6a96e74fd99632a23ff27979d SHA-1: 988e756a535b14f4b4b81bc9ad1af97553f8f6d6 SHA-256: 776adc3c51e13f406a2e500723c07671248652e4d8fb1f1f35d805d20202d49a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the nature of the detected threat point towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=hack+aimbot+roblox PDF link annotation
    • http://ltpbetel.ro/userfiles/file/niriwonajepitim.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97021550880.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/30981f2336085645d23dfb13d3fe4590/nalefuvamag.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/xixupiliwibaxedur.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/77574626425.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vivizoxananisakiwusasopov.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/29247172056.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/10821903469.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/kuvogewowikikotirexejabi.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/4679176068.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090310360665.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/69207993474.pdfIn PDF document text
    • http://uteambio.com/upload/files/36061368273.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161348dea9fbb8---40460978752.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_11_10_57_14_6926.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/78662962526.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/48890386285.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/mabevera.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/1683774932.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/62757670005.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/vugesabuvujeme.pdfIn PDF document text
    • http://sparkpro.lv/content/file/nosum.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/44215168207.pdfIn PDF document text
    • 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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 17916 bytes
SHA-256: 920b0b09c146022655f9ed723f1c3c34f4072aa8d0d2d1b9d0ac9fda339a5750
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 10312 bytes
SHA-256: 0ada34ea051167cda92c85dd5f81c0bfe5a6a7469df613523679a9c81c2656ff

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