Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a00a68ae1f2947…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 16:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5aea423080358d9490d0a1b5a3f75515 SHA-1: 70b9d8b2e7d5cb2db81ebde0861a464f0d6c8a2e SHA-256: f1a00a68ae1f294700260c843a08595345554787af8be20175871d7146c70bc0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/wuwaziwajuto.pdf In PDF document text
    • https://aynadakikemalizm.com/resimler/files/39145261596.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/pujofidugajazaxatax.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905092140161597.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/pawikoramigosisuvelowero.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/jusotofatugum.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/58149787663.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/gesekedikigomonuvikexebak.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/20000226193.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/notebapumigeri.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/pizokir.pdfIn PDF document text
    • http://czyxchem.com/upload/files/pojeru.pdfIn PDF document text
    • http://bluebossa.pl/files/file/sawubenusapadikonogo.pdfIn PDF document text
    • https://clickbox.ro/images/file/18614992888.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145935be89bc---32725768576.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/72886235177.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/sogiket.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/11931285333.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfeb1692a3---6714700019.pdfIn PDF document text
    • http://pmke.cz/pictures/files/gipadebavemojenu.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/sesumekifovisejakag.pdfIn PDF document text
    • http://theponghop.com/upload/files/vubofijarakizefo.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/9566603964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rogue+one+tamil+dubbed+moviePDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 18680 bytes
SHA-256: 15e616c50b53da00a230ad8a93a9a7ab5f19ec815e01ad412b45f73a7ce58bf7
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10676 bytes
SHA-256: df5a856bba52de0e52dcd6c2d194f50755800859e6a8d2377eea9ea585dbf6b0