Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bc84517be1923e…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 13:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c57e27fefd5f1e86d1854a5c3627fa3f SHA-1: 59b22d4651f5a3e6a6ffbbabe678c74f2414b532 SHA-256: 83bc84517be1923e29db3d1ea14693f89e670486bcfee3a3212c4a225e5023b1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://fokemale.ru/strik?utm_term=us+history+regents+practice+questions+by+topic PDF link annotation
    • http://ouily.xyz/pirinowo1km8u.pdfIn PDF document text
    • http://springwin.space/kubexolr21d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_60029f4fdafd6.pdfIn PDF document text
    • http://getcreditcheck.info/how_to_factory_reset_lg_g2_minicx4t9.pdfIn PDF document text
    • http://bestrongbyg.com/terminating_employment_letter_template2cv8o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_5fe976b6b941c.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415055/normal_5ffa9b100603c.pdfIn PDF document text
    • http://kuziwikokawiz.iblogger.org/what_do_the_colors_of_flowers_mean.pdfIn PDF document text
    • http://stavki-na-sport.site/8428854413555ywf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5fe1a2ac1e001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_600aeb070983f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc429c9-65e8-4861-81be-82bc4a1d30bf/2002_ford_ranger_service_manual.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_0cea35e8ece146cd8b48d4b77377b38a.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_3a00b32abd554ce29c4c83fd91e64025.pdf?index=trueIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_4cb4006abf344047bfe537a9152368c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/051870f1-a9c7-499d-a196-c8c42c2d6c0c/remington_700_hunter_magpul_cal_308_win_canon_22_filet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e881e197-09eb-434d-9328-4522e43cbd64/core_java_interview_questions_and_answers_for_3_years_experience.pdfIn PDF document text
    • http://fidazel.epizy.com/39716354797.pdfIn PDF document text
    • http://rulopumo.epizy.com/vimojorariwivufake.pdfIn PDF document text
    • http://ribowofipap.rf.gd/abasa_surah.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_52037b6e47fd4ae4ac5a9382c0f34aed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62bf2ae-97fb-41e0-b5b1-960996ff2bc6/83689393553.pdfIn PDF document text
    • http://bubevovenekofaj.epizy.com/74905937384.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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 5524 bytes
SHA-256: aab631d80627bd984ab5792346cea8991f67a330b46f276ab105a40f39596d16
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 11636 bytes
SHA-256: 1e8dba9dcede5625a4e86e125477f28268bbc239004841db30a2b18bdb231ffc

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