Malicious PDF — malware analysis report

Static analysis result for SHA-256 973b91bfac54e359…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 07:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c556575b4fbbeb694acb287dec579032 SHA-1: f9bb02b421246a309602e627939124392214cfcf SHA-256: 973b91bfac54e359c40fa0cba19e7ad9916a6d78be2df60b0736ce4baf46cc43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. While no scripts were directly extracted, the PDF structure and the presence of external URIs suggest it may be used to redirect users to malicious sites or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://barahi.com/assets/userfiles/files/raligedajak.pdf In PDF document text
    • http://spostojow.pl/userfiles/file/roxeruvagovefeneviwe.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nebijalapuwutenufuzuxa.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/midosukowoxofojonamurij.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/48724841715.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/lavijesibunanazaxik.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/lutiwife.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/70171605702.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/34989739897.pdfIn PDF document text
    • http://exim5.hu/_user/file/talisixepijekofemalu.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/53117953460.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/21900584953.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/17874415253.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109170809118501146pyb2.pdfIn PDF document text
    • https://motecx.com/images/file/wefumemopepoboxe.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/javavokimowutisawixixe.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/56950849283.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54080733106.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/28469051435.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zogupupijogiruboretaro.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/49820922569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cordova+android+target+sdk+versionPDF 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_off0000addc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDC 15272 bytes
SHA-256: 649d17fff6b755ea98d3bacf908d304733058222cf7dd6da737d7b96c7e119f0
font_01_sfnt_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 10564 bytes
SHA-256: f61b7a865f67d1c840e7dbbeb88eef635b7b1215e0e6d2a845af5b36a2157ff1
font_02_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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