Malicious PDF — malware analysis report

Static analysis result for SHA-256 f418f029e68a9e92…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 09:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03fda181cc9e069a5d03656ecb505884 SHA-1: cc75009f3ace78a4bd6f953523eb8a8aa8b69551 SHA-256: f418f029e68a9e92046c9fe0d21f123e47ff1cd8a262333e510fb9b73027d83f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to disposable domains or are part of a link farm, indicating a phishing or scam attempt. The presence of embedded URLs and the heuristic PDF_RANDOM_URL_LINK strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://chcial.ru/uplcv?utm_term=dark+souls+2+summon+range+calculator PDF link annotation
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/45256486304.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/79138812558.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/31693296471.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/regakup.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/58037724231.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vameg.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/taneraduxuj.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/9925112429.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/66095177912.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/64341875492.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/novevadafudumisiwunenugu.pdfIn PDF document text
    • https://12shio4.com/contents/files/sozabiwu.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/18813075874.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/tubomadafaxepedama.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lutapegirupisigi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/15199441841.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xexibepitenosobolinev.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/47342005519.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/6438643680.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/rubizixijotagim.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_off0000aad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E3 15976 bytes
SHA-256: 474f010f2119f4afac9176873fdfac90f27a417cbfc5f85e4ddd69ef4bccf92a
font_02_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 10792 bytes
SHA-256: 2dd6f3772011f0c2554e1b4b7fa3a3a42faf5b1da4444947a29e877b18490e17

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