Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d03432ff0bb2e75…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 11:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a710661413b19dceb0ff21b791df8f9 SHA-1: 5051eb0246f95efdb072d0343ff0b67285f443d5 SHA-256: 9d03432ff0bb2e75de84223309569bb72273c825b0176b0e4eb3d4c910066cf9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external PDF files hosted on various domains, many of which appear to be part of a link farm on disposable hosting. The presence of algorithmically-generated URLs and the overall structure suggest an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aktifimmo.lu/userfiles/files/58493472796.pdf In PDF document text
    • http://thebankcardservice.com/uploads/files/neveg.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/20621467216.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613515d027d7e---26628798882.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/24849381162.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/josevudizisaramepozezuke.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/52437697025.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/37141052494.pdfIn PDF document text
    • http://samtle.net/ckupload/files/7319094110.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/77546227228.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/vorigix.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/voxefawoburifomesile.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210910190621.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/67302365950.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/jovusukemovekemupov.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/simawi.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/61904566463.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xirobogidit.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/11155877154.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/mipinilopasuzuvinud.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/4883007999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=for+the+love+of+physics+free+downloadPDF 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_off0000b682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 16176 bytes
SHA-256: e6cb1822f023126cb3c0c5dfbc54a48caa7d53178c5044d0bf2c18fb6a69a3f0
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10960 bytes
SHA-256: d712869ee2683742b9b716fddd44542e149ef21cf3fe8e88d6609f41abcf52b8