Malicious PDF — malware analysis report

Static analysis result for SHA-256 786e45145722744f…

MALICIOUS

PDF

89.3 KB Created: 2021-01-26 02:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a6ef010e6282199e6924eb168151cc6b SHA-1: eb06466e880fdc2139b65a639a889fa1deea8dbb SHA-256: 786e45145722744f4ef8683f6f73b8578790ff6438bebfafd2de12add2fc7bbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=brentwood+school+district+ca PDF link annotation
    • http://instahelpforbusiness.com/29707464222h52f0.pdfIn PDF document text
    • http://websporizle4.com/forest_animals_coloring_pages_freeoa50p.pdfIn PDF document text
    • http://kengoru.space/49993501139bsnal.pdfIn PDF document text
    • http://ita-fitness.fun/20176re6u.pdfIn PDF document text
    • http://stavki-na-sport.site/9409288371e47hu.pdfIn PDF document text
    • http://crawlmqyu.space/36053742059l2gxd.pdfIn PDF document text
    • http://ryukzak.digital/usa_18_wheeler_truck_drivertxdht.pdfIn PDF document text
    • http://dorightschool.com/calculator_apps_download_iosg9wlq.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/lefugumujevexabitofidog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapetevik.epizy.com/edmodo_for_pc_gratis.pdfIn PDF document text
    • http://toxawilel.epizy.com/70840307185.pdfIn PDF document text
    • http://pevivudawof.epizy.com/25029002746.pdfIn PDF document text
    • http://jenuvuzawo.epizy.com/aprender_a_leer_preescolar.pdfIn PDF document text
    • http://zazasos.rf.gd/tifagigavenopile.pdfIn PDF document text
    • http://leporib.epizy.com/circle_theorems_worksheet_tes.pdfIn PDF document text
    • http://bupozefi.epizy.com/ruwarajoxexadetokejeve.pdfIn PDF document text
    • http://daforewepon.epizy.com/sasebalefitubusajapi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 10056 bytes
SHA-256: 5c5717c554f11d0c3c213bf630f0dda00a2e42059538f38ef79b0e1a8d3fb894
font_01_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 5168 bytes
SHA-256: 92f2ad491a28533a06d62ad99b4d14e39b17589f82c9ff29bdc841fafffc51b0
font_02_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 12496 bytes
SHA-256: 9ef9561fd5e5e90567f2d359f8a31e62335c0f7caf77e4b445125a51ede3cee0