Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a03c9fe6a205eea…

MALICIOUS

PDF

103.6 KB Created: 2021-03-10 16:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 39a8a5a7e4a0820a082a4cc076e34308 SHA-1: b63492b91444ddfea2cfffb3ba9f7f2caafecf7a SHA-256: 8a03c9fe6a205eea3e927096bcc7cbc4c696b0d61a3ce42feeea1e461d2b4983
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable one pointing to 'xajibur.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that this document is used to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=egyptian+mummy+mask+template PDF link annotation
    • http://nukels.xyz/supilonogagi0rhie.pdfIn PDF document text
    • http://itfamily.info/ap_human_geography_vocab_chapter_4swmyf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_6035c8915b3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5fdc5398c54d1.pdfIn PDF document text
    • http://polfact.site/63147076935mxi3w.pdfIn PDF document text
    • http://good-production9.site/trane_xv95_troubleshootingev4yb.pdfIn PDF document text
    • http://iranomics.com/zbigniew_herbert_heo4lbym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6045e78ed9938.pdfIn PDF document text
    • http://zakofuta.66ghz.com/classifying_matter_worksheet_grade_7.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/f5a103d2-21f2-45a4-9b4f-ee6884621290/how_to_use_zoom_microphone_on_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1e804d-03d4-45c7-9af8-bcdde4374998/are_wrist_high_blood_pressure_monitors_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d510aad9-a4e3-4541-bc1f-94b346f50d06/stihl_weed_eater_head_wont_spin.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/white_christmas_tree_red_balls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ce530e-7c16-4fd8-8e1c-784c19116445/gazejebomivixasadomewujaf.pdfIn PDF document text
    • http://kimitumepogamom.epizy.com/verizon_internet_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/39780856418.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/bandook_chalegi_teri_hd_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9722d0f-1eda-4ae6-9c81-7538be3a68b2/wopanapodidolixabej.pdfIn PDF document text
    • http://jekivuzogir.rf.gd/jumpers_knee_strap_volleyball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24aa9a3-ef37-4619-969f-33af9b4bd37a/how_to_do_nothing_with_nobody_all_alone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a557700e-26e0-4af7-b8e4-89e613c511d6/14210461468.pdfIn PDF document text
    • http://dikokek.epizy.com/87070211069.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_off0001592d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592D 5168 bytes
SHA-256: 4ab3d6150816dc01761dd172d6ce89cdd32f01692575237db482f939ddaa5e73
font_01_sfnt_off00016aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACA 11340 bytes
SHA-256: 2d8c1d7cd39d474bf4d4538ff9f534c779f00aa9dcd7347a17ff56b02c885647

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