Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35d18dc612b09a9…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 01:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4eef1565b7056c51f0d75a2f5718917 SHA-1: df3461ce867ac00ebc85b19495f83405006eb5cd SHA-256: f35d18dc612b09a9213e95869698acc652ad436ed85b62d6503f161c27fa8273
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 0.9992

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://jottigo.ru/strik?utm_term=how+to+make+a+man+fall+deeply+in+love+with+you+messages PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447658/normal_604cfdf15530e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405181/normal_5ff55339a71ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_601a4cdddc641.pdfIn PDF document text
    • http://dopenukivo.22web.org/xurogiberu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_602bdc475d95c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477873/normal_600985e754979.pdfIn PDF document text
    • http://formverifiedbadge.com/kakoxibx7ulz.pdfIn PDF document text
    • http://tenopokas.22web.org/restart_1_student_s_book.pdfIn PDF document text
    • http://zarabatyivat.ru/25343777334s1gih.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://hookup756.fun/lean_management_system_six_sigmaeej4q.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/zebco_202_reel_instructions.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
    • http://batawovajupofu.rf.gd/gigantiform_cementoma_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a5d41f-b90b-42f6-8004-5b608e278c88/wevesijesaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48ee190-60e5-4e20-95ba-1a696dee6f92/how_often_does_a_kindle_battery_need_to_be_replaced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95534de6-cc8d-451e-919e-e9784fee9f5d/xajibokavele.pdfIn PDF document text
    • http://lopafulobitap.atwebpages.com/kikeretuzomepazepuposuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c602219-854a-4f33-8d01-940166b50c07/jinenobukavab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f85cf6-375e-4ff5-8c61-a02270bf7120/yaesu_ft-450_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9261087-da4a-4e47-9aee-796f7795d8e7/what_is_the_highest_rank_in_one_punch_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e09740-8e54-4258-8af4-7fe48840aa3b/champion_generator_9000_watt_costco.pdfIn PDF document text
    • http://rilefup.epizy.com/34640595055.pdfIn PDF document text
    • http://kugikejovapav.rf.gd/37746177755.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_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 5520 bytes
SHA-256: ee573ec363da94de7204f6e932d6ca48bf071ed1cba6b498b4e1d5367c372886
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 10976 bytes
SHA-256: 2ffa600abbfca60b201166f5cacd9caf8da92d746dc03786afc9de6d4742b651
font_02_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361