Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf75d2f1d9e538b…

MALICIOUS

PDF

79.5 KB Created: 2021-10-09 00:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f3859e9757dfb354bc242de78be4868 SHA-1: 3e393a31922c9ff2557e859523315f934ab77120 SHA-256: 8bf75d2f1d9e538b7b77b9232b76ad06e7d03d7dff4dbc7e5ef6c1a8287bf037
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=how+do+you+start+a+letter+with+to+whom+it+may+concern PDF link annotation
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/vuwixetilolegesevux.pdfIn PDF document text
    • https://iword.de/userfiles/file/61971935086.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/60649147122.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c82a8717d7---zukip.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/gofudoweduxelaweg.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/90290828209.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/papemunitiwepimuwotezuw.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/difudimogenetimefadisud.pdfIn PDF document text
    • http://devveb.net/userfiles/file/54809590288.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/63813052831.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/98654153528.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/83244977346.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/rupem.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/47106891294.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/81256044642.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/wasavudoxokuzorafagik.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/jusatovoxuwa.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/55223053171.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/xapipitinazedujanuvagagil.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/xakuwila.pdfIn PDF document text
    • https://autoskola-scp.com/files/55372987848.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/popesebulijuruvabiwatawa.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/kevupilumejav.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_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 10924 bytes
SHA-256: 540b603220ad460c9e9f7c17e4e5158ca6a423b90219b2824329a9cfffa8b55e
font_02_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 18500 bytes
SHA-256: b710706fc757cd73be5bca1ebcf48f003f441c1ac464d1a078e5d5c5783f2b1a

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