Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f53884efbbdb30…

MALICIOUS

PDF

70.2 KB Created: 2021-02-09 13:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c3c65ebd8e3a6420e2cee7dc21eef8bb SHA-1: 042bbf80e04f4d93070ac0646d2433f1bea91039 SHA-256: 24f53884efbbdb30448c836c25904fe7e592e83537cc1e48f3b391fe3f9bc1b5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/aws?utm_term=hp+pc+bluetooth+driver PDF link annotation
    • https://cdn.sqhk.co/zofizitene/zGpGifN/28486940882.pdfIn PDF document text
    • https://cdn.sqhk.co/rebosuvut/zgEHjfT/gold_farm_wow_8._3.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/jjBUtIY/outliner_pens_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/ipijgcK/drive_in_theater_oregon.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/4jeicZl/how_to_say_hi_in_chinese_translation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446636/normal_5ff78dce0de89.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/Jdhaoja/fituralifezaforidinon.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/A7njdgh/vamagulopoteloxer.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/XjfE3G5/how_to_bake_sweet_potatoes_whole.pdfIn PDF document text
    • http://rezefad.22web.org/assembling_and_disassembling_of_pc_ppt.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/semunag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fdaa93dcb63a.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/jeicmEX/how_to_draw_halloween_characters_easy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5ff6ae85d1b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_600dde1fa9cf2.pdfIn PDF document text
    • https://cdn.sqhk.co/najuvotuwoz/iixGMU8/gunogumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 4936 bytes
SHA-256: 3e544a2a157645ea6eea6949fc43b180173543a9650cc579ac86849c5ba7dfa2
font_01_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10268 bytes
SHA-256: 99ac87815f5e8f3cb26630838d18cecb8eb550756593d42b40c3e92c12bb3b0b