Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ed043bb0934d06…

MALICIOUS

PDF

71.3 KB Created: 2021-02-16 10:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: edaf65db05b61fd00a1be15148b9382d SHA-1: b3d119edf3c04b3371df962d58e3b9b62b833f2d SHA-256: d5ed043bb0934d06b67491c82d893598f1c87e45f94d2630624ee2906bf6efa4
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://seumenha.ru/123?utm_term=oster+bread+maker+whole+wheat+recipes PDF link annotation
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/zujij.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/iclnHDf/secure_folder_galaxy_s10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5fe998a9ef6b7.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/pacsun_customer_service_number89gm1.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/iA8ijxp/battle_for_the_galaxy_le_apk_download.pdfIn PDF document text
    • http://4d-5d.com/stair_runners_carpet_right16et1.pdfIn PDF document text
    • http://metazoaapc.fun/lomokarabxwysr.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/xepuretamibosapita.pdfIn PDF document text
    • http://letxxnx.org/chinese_drama_listhlt7g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fc678b1e3bf3.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/gfgcgj3/xodutariluxe.pdfIn PDF document text
    • http://fruit-ital.space/stellaris_mod_locationvjjqt.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/MhciXMT/joxuk.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/jgujggi/20418796327.pdfIn PDF document text
    • http://leopolds.space/kepoxewyb6t.pdfIn PDF document text
    • http://car-test.pro/smart_action_plan_template41g45.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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 5636 bytes
SHA-256: 287e4cabbbe4832309a856b0d35747834622d09198dfd27845143443e90b7b3b
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 10612 bytes
SHA-256: 1e3f42146cc8084167dafc4c672c3169b4ef962347917b271be71dcb63868c47