Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bb61257646d361…

MALICIOUS

PDF

79.7 KB Created: 2021-04-15 14:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee1ee9fd77e59899799067791934b90a SHA-1: 5382ff1a6a7d7a7df6849e21089c4be5f64aac0e SHA-256: 91bb61257646d36104f91172b08386b3207d69432bd916617771a83d01ce2a56
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=medieval+dynasty+food+storage+worker PDF link annotation
    • https://cdn.sqhk.co/wopeporamo/cNnhfgj/wozitolekiremakogodufoz.pdfIn PDF document text
    • http://copyrightsupporteds.com/toxowulwk2.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/8139237.pdfIn PDF document text
    • http://sayseedokg.com/751144012037mbj7.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/rifasidajika/fYbShbb/worlds_biggest_crossword_answers_182.pdfIn PDF document text
    • http://helpcopyright-service.com/812363918558fhd6.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/iiTjdhi/9057910902.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/davizirifijode.pdfIn PDF document text
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/basuwuzawo.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/9cfcfaf3-e204-4737-b431-92d010acf653/how_to_draw_anime_male_face_for_beginners.pdfIn PDF document text
    • http://tesaminovosino.epizy.com/ruverej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6a7b72-5c97-4db8-849c-38b30da5120b/64237963417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00d0375-1c23-454a-94cf-f6d60b2d4f76/freelance_academic_writing_jobs_online_uk.pdfIn PDF document text
    • http://fapugiv.rf.gd/mibixulurafajovatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b7a6d2-51a3-4425-a7df-05d0b92996e7/lg_hbs_800_bluetooth.pdfIn PDF document text
    • http://zozipavakaxin.rf.gd/3324765600.pdfIn PDF document text
    • http://dijovomivuz.rf.gd/accelerometer_android_kotlin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fbf99db-26a1-45c1-8d9c-1e9aa6b8769d/swisher_trail_mower_belt_diagram.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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5184 bytes
SHA-256: e781e027af4d2a394c056ef02a5d9b5d1301fcbd7bb31418567b5192b5cb8663
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 11528 bytes
SHA-256: be43f372f5732f2d12947036854282312fb85d6ada532b3ddc9f8387640c5e58
font_02_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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