Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffef179bf1661a5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 19:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bba74b176a719fa6e63f3f2bd3975a11 SHA-1: 3f5cec195d632cfd4e8423ca1d925af2388b29c2 SHA-256: 7ffef179bf1661a55417386633d2a69b62397e81bc4c5869e726c1de1d4f6a72
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with exploiting vulnerabilities or tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=administra%C3%A7%C3%A3o+da+produ%C3%A7%C3%A3o+livro+pdf PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f698db65a---44918341634.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/3320990733.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/11177878138.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/lenoxabavaluve.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/wumuvexunumasusatovinujo.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/72768183811.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/34254598476.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/futobafu.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/95904974763.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/berexivipefulugoniki.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/bapar.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/vavupagalapokenaja.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/59861350537.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/zavafu.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/xazekepakugufalome.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/pimojugexuneve.pdfIn PDF document text
    • http://guclupin.com/calisma2/files/uploads/gidunotomimodoxexomigumi.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/19460196462.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/733105796.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/16507079405.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/rotozavikulizisajisisu.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/88351816932.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/8374592707.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/videpevifanefonu.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/rorafixofutatirozizujebo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/velisiz.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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 20836 bytes
SHA-256: d780261565f5c408facb78e1868c8785a868e2d50123b03555e31e062da1342e
font_01_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 11136 bytes
SHA-256: 80b933721e8806e364df15ca8d3d77f3617a12c6b1247d1487b75d5f14b82050