Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cfd83b90483a18…

MALICIOUS

PDF

76.5 KB Created: 2021-02-22 17:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 450afc9a6637039ae2e4108ea40f39d2 SHA-1: b962386096686dd7413e35ebaf8361b6c0b55858 SHA-256: f2cfd83b90483a18afdd1ab63b7fa602dfb7ee43198903f737395f960033239e
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, including a redirector URL pointing to 'jacksth.ru' with a keyword suggesting a lure for game hacks. The presence of these links and the overall structure suggest an attempt to distribute malware or phish for credentials under the guise of providing software downloads.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wix?keyword=sims+freeplay+hack+apk+download PDF link annotation
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/1625576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fd6c3446a6d3.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/MiaicOI/1_year_calendar_template_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/4jdOgdl/king_of_avalon_dragon_warfare_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_600e4963d9a45.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/gimQFpm/download_real_car_parking_2_mod_apk_data.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5fe2ba71242b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_6014b23093970.pdfIn PDF document text
    • https://dexulana.weebly.com/uploads/1/3/4/2/134234773/532400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5fd76dde17e77.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/M1hdZOZ/funky_karts_crazy_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/QbmggVU/ear_piercing_gunshot_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5fd82bd4aaf30.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/qhaPmoF/59270511458.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/7698781.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/cjbIjdf/can_you_connect_9_dots_with_4_lines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/79689580662.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/wewotusekapafokako.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/22654205178.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/49529432697.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 5756 bytes
SHA-256: 5a6c59b91d5f2c8b9d1c0ef29f71aa859a35ca3771f4d0e3da485990e80572bc
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 10528 bytes
SHA-256: d9482bdeeb93b0eb5b07e973cb50136237e93dd9d61250fe8288e1774e6d1db3