Malicious PDF — malware analysis report

Static analysis result for SHA-256 816a188d35153dc8…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 13:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 470d6dad10127e6199f1fac913991a75 SHA-1: eb5cad9421ce485f408951c46de446d3a0f77d80 SHA-256: 816a188d35153dc886f7848a9292de14bbd38b46d34b16d8a822f37d4cafc164
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or phishing. One prominent URL, https://lozipotod.ru/123?utm_term=halesowen+college+nursery+ofsted+report, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=halesowen+college+nursery+ofsted+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385202/normal_604dc53ebe0df.pdfIn PDF document text
    • https://wufurivukotep.weebly.com/uploads/1/3/4/5/134585879/139870.pdfIn PDF document text
    • https://tixuguzuw.weebly.com/uploads/1/3/4/0/134096155/namaje_laxewa_zawuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_60041b367cc9c.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/2729479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_6035233447e0e.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/wulul_safusemud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460071/normal_6002be7ee654c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_604e2e8945637.pdfIn PDF document text
    • https://xulazipilo.weebly.com/uploads/1/3/5/9/135958699/8241475.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/153b6aa7-6a55-4195-a060-f48e5cef9453/57216704532.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/dungeons_3_mission_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e5b4a7-9687-4905-9b83-d514f82fb05e/bissell_spot_clean_professional_carpet_cleaner_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/gavikuguzilurelabakiwum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d08fe92-7a7d-4db3-9422-e06d1843f17b/brinkmann_smoker_electric_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae190127-bd4f-4043-b7d1-71973c010c5a/how_to_turn_off_sensus_water_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e780199-7ddd-4046-a281-7a637d6ac847/gujamevitukenuxoxomus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ffa6e4-4efe-404c-9a46-59005eaf5da2/6_main_roles_of_the_presidents_fulfill.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/baird_42_inch_tv_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243c4053-f77d-4112-8924-d9006b7a559d/wiroxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd644a6-833c-41c3-a3d5-306ee6248c90/how_to_reboot_moto_g6.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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 5312 bytes
SHA-256: 9fbaf4c5116f2db2a60f6fce88ab15f025472df76698f9a9ac2babb698003677
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10152 bytes
SHA-256: 84a6ed5d3517d38e53ee1e62ab4adeebc21ec251910f62a9baf759d1ea7d6e85
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3