Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ae590d9e7d84a7…

MALICIOUS

PDF

75.2 KB Created: 2020-12-24 05:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3fcf741e23a49b399f301a9983d993a2 SHA-1: 505bc00a25c9595f2363cfeca07c4fc42c4a706d SHA-256: 52ae590d9e7d84a799cc734a292d7d0ca6fb1109964a5df9fa1965d512511765
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafficel.ru/strik?utm_term=ark+survival+evolved+kibble+wikipedia PDF link annotation
    • https://cdn.sqhk.co/xuxumududu/MSNIGhi/rimoluja.pdfIn PDF document text
    • https://zirubelazuzo.weebly.com/uploads/1/3/4/7/134747961/05ab4cba04.pdfIn PDF document text
    • https://cdn.sqhk.co/jegisizozul/ibjePia/fantasy_flight_star_wars_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/gjjdigg/tattoo_studio_photoshoot_ideas.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/02bb26b3-9b16-46e1-bf9e-8cfd8992d57b/35962226753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc47d1f-26c7-4104-905e-d89382259b2e/55196708269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a59faa5-3db9-4c9c-a875-f33f2dce5173/level_3_to_comp_cape_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5191e405-3781-42b8-a73a-ea53c9207c66/fsa_reading_practice_test_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec897ba3-6c06-46a0-a103-312f666f280b/88602635514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be864655-9c56-44af-b8c9-d7edcbb7c13d/mabubotemixinetal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2c9f55-a1fb-4542-a1d8-e5e3c5b0af79/space_run_game_download_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 5300 bytes
SHA-256: 2fdfe5f2e90f5faf9f8d3ccf9f1186711c2f7e448a9baeaccf43f66038fcd073
font_01_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10808 bytes
SHA-256: 1c29295f7ab578a1921079666bf21606fa4dd19a4895106d1dafe9377bdf343a
font_02_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 16124 bytes
SHA-256: b5880f88fc9e5617af74cb89d4ef8ca33dba23f9e4d074d2a1f4b6a81569548c

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