Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a8716bb9bdb8d0…

MALICIOUS

PDF

67.9 KB Created: 2021-10-03 11:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d7aa50abecc35263f2d1fa3455743d8 SHA-1: 46df902e5de292bd16af00a1d91cd7f7afb8d314 SHA-256: 83a8716bb9bdb8d075fecb0b73ac52d37d0de30e93a0408f1573d85e402cf77f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it is used for phishing or to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting. No scripts were extracted, but the presence of external URIs points to a delivery mechanism for further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=the+good+wife+script PDF link annotation
    • http://forti.in/userfiles/file/31924751323.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/19178559359.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/zufutu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/ligezetujudasulidasiwi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614056b82f3c9---76354745505.pdfIn PDF document text
    • http://secoinblock.com/upload/files/17303174004.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/9561009908.pdfIn PDF document text
    • http://enewind.com/pliki/file/wipinadapiwef.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/2205934485.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vuwilaxagimefuka.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/kudepakexif.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/2330381540.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bekebeduranuj.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/rodomipidoton.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109061520374395.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/96290203766.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/zutodus.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/luvig.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/babexaw.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_off0000ab5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36D 15172 bytes
SHA-256: 7c61f9916a9845212302177e1d1d98d91dceab9442080b609a836f1938698fbe
font_02_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 10636 bytes
SHA-256: 11051f971c91a6c15aa2244c8eee1ba741fc376b0d25b1193ead7ad030fc7130

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