Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de11adfdf6be3d1…

MALICIOUS

PDF

82.6 KB Created: 2021-04-18 11:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4e02e66b98b8c521d22073a3dc84dc6 SHA-1: de5cac4c07a20b9e72ce4fcf152503a9f7833a50 SHA-256: 1de11adfdf6be3d106ef32ee70d15474c99c49e30040d279db3d5ab440c97d85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=inferno+by+dante+alighieri+summary+pdf PDF link annotation
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/dd590e2c5e.pdfIn PDF document text
    • http://lapuxuzogu.22web.org/vocabulary_worksheets_for_grade_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_601780ec84a15.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/pojamuwabugumip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467955/normal_600667393d419.pdfIn PDF document text
    • http://getdouche.xyz/rifurijidiguleoarf.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/last_day_rules_survival_recipeszigzs.pdfIn PDF document text
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/kimero-tijimuvov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd9f5be204dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5fdd9655f1443.pdfIn PDF document text
    • http://reetodo.online/noguwosabowhk5b.pdfIn PDF document text
    • http://sigifiketatoge.22web.org/47995132774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_60571d23e43e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidazuwanu.rf.gd/ataturk_the_biography_of_the_founder_of_modern_turkey.pdfIn PDF document text
    • http://misugivunuzu.epizy.com/lidovakudoxevakagijipu.pdfIn PDF document text
    • http://sujidise.epizy.com/forest_stay_focused_pro_apk.pdfIn PDF document text
    • http://mebijido.rf.gd/honeywell_tower_fan_customer_service.pdfIn PDF document text
    • http://nisifeledarin.epizy.com/40086587843.pdfIn PDF document text
    • http://rifobotulaw.rf.gd/as_400_system_administration.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_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 5636 bytes
SHA-256: 20704fa69433e77e8aca12f0c1cc886786230bd43b81d3c0624b254aa8910b38
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 10184 bytes
SHA-256: 4fbf746c8224c8df248ec3d99fee391f49239909c7d8d1b7be82634d0f3c79f4