Malicious PDF — malware analysis report

Static analysis result for SHA-256 892461d707ea5040…

MALICIOUS

PDF

77.8 KB Created: 2021-09-29 14:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 020d8cdd4730bda6067265e4180b0929 SHA-1: 2d41e10f8a3aad8cd6627a92986c1eaee357c7c7 SHA-256: 892461d707ea50409ec91c5bd84707b9b1df09f6b7ca7320f3b252b8cc1fd5d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains, indicating a link farm or redirection mechanism. The presence of embedded JavaScript (T1059.007) suggests the potential for executing malicious code or redirecting the user to a phishing site, aligning with a Spearphishing Attachment (T1566.001) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sisparts.pl/zdjecia/fck/file/kolowibitu.pdf In PDF document text
    • http://qcfloor.com/userfiles/file/74600421538.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210915_223232.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210905095526.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/57661584397.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/92140788963.pdfIn PDF document text
    • http://weingut-suppan.at/files/41324729357.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/lisavomiramimawojagopakij.pdfIn PDF document text
    • http://beta-rc.com/upload/files/45036158696.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450ea01524f---88084082760.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/rozuxinive.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/36244856637.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/38380413899.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/56916840434.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/88257268557.pdfIn PDF document text
    • http://biomehl.com/images/content/files/2554060342.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/25253440219.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ac78d3319c4eddbf38c1799ed299d930/77540668609.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/15395834654.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/90833537175.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/99521734575.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/49643997489.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/sodap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mi+box+3+chromecastPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 10752 bytes
SHA-256: 7f801412e376dbbfc4193f2e258030d23bf037670d67062460195ea736b351d9
font_02_sfnt_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 18856 bytes
SHA-256: 5fa9bbd405dbc23316a34cc2e0e961bac31027146e51f8534d5eb16dfc08dec3
font_03_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34