Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff09b19baed4f67…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 03:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36f78dd19f5a971bfe2e0af4b878b4df SHA-1: 6da464b99e709026ed57cf0cb5832a93c8dfe48a SHA-256: cff09b19baed4f67e03be2daa12b55c3888766687c0b7137b03008949692fc0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm or content distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dobrejaja.com/Upload/file/73685573670.pdf In PDF document text
    • https://dovolena-jiznicechy.cz/uploads/xiziluve.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/bidipurijexujok.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/bisateropifowuvoti.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161435fb40da57---fipotutebunosuvimobu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fuvuvotefaleletumojani.pdfIn PDF document text
    • http://koala-al.com/d/files/juwadijivakoloripowab.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/paxamuvokozuwupov.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/94100207673.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/vodukigibiside.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/vofirawenar.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/32774771608.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/54438597459.pdfIn PDF document text
    • https://digireg.com/upload/58217172499.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c6d3d81---kufimanepo.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/bafaterela.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/dogumoxedupu.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/zulokinugiluvulalufov.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/gupat.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sunekifakibiduga.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///2441763739.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/34254598476.pdfIn PDF document text
    • http://samtekelektrik.com/files/goxavajawobozexupebozebur.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/55279594541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=canyon+defence+unblockedPDF 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_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 10488 bytes
SHA-256: 69119bf288ea39ccf4faabdce5a8e00228770023f219ffee8a6b8ed57f1bd247
font_01_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16556 bytes
SHA-256: 76a10f01c4965cb97626e666077f1cccece981cc3eaefdbda976db956680657c
font_02_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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