Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a79fa9ce38144f0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 11:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ed91dcf3fb9e49762726bb4f510e0e6 SHA-1: da655b73f83171e5b224b99d8f8e326094d1b7df SHA-256: 3a79fa9ce38144f05620e2b5832e4c46c7a0953305498b9d43400716b14c310a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various unknown domains, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous embedded URLs points to an attack pattern focused on luring users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://0575zl.com/userfiles/file/48730953463.pdf In PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/31130077280.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/75455561832.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/5862489465.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/43656257203.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/solexefi.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/19753191371.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/jixaxuvosiriwulejuzefari.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/88269100223.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/xutabijaseladigebufef.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mazimukabomuvepeg.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/vunolipelazisezevomonige.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/sufajag.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/9634309664.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/55280208791.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/48252713932.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/78704834970.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/wajiropudijoke.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/97326183317.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zuduvifawamosulaxobin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+malayalam+tv+channel+appPDF 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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 10416 bytes
SHA-256: 960d2048c5098d195ee3a1d5a729a2532b05bd8abd69ec4fe8f1473ac17f8281
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 17316 bytes
SHA-256: f85bbaa668048b026c7a40b102d9030af8da715e58323ef9f81905b775352f83

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