Malicious PDF — malware analysis report

Static analysis result for SHA-256 c829aee964d5c476…

MALICIOUS

PDF

80.5 KB Created: 2021-06-05 10:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: de229703f9268b7844e11ccbb88aac7b SHA-1: 2a71902806a03abf66926401f348666bd457b2c5 SHA-256: c829aee964d5c47605fd00761aae5a4c315f181387c25471e2dd5f05abd759f7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to 'https://drafthe.ru/pbw?utm_term=how+to+open+acer+iconia+tablet'. This URL, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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://drafthe.ru/pbw?utm_term=how+to+open+acer+iconia+tablet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484363/normal_602878ff41968.pdfIn PDF document text
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/lezivezitanumunakubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_601845d18bcb4.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/6869642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5feb94165fbc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_604ce6e02344a.pdfIn PDF document text
    • https://lubumona.weebly.com/uploads/1/3/4/6/134648672/a7cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_5fe7f7436491f.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/b0ed12d3b03c.pdfIn PDF document text
    • https://xinufagepowe.weebly.com/uploads/1/3/4/4/134437511/kasoruzenozofafedezi.pdfIn PDF document text
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/aa839e4a8f.pdfIn PDF document text
    • https://zodukoweferu.weebly.com/uploads/1/3/1/0/131069906/kepozirorelamunisez.pdfIn PDF document text
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/e9f5f81053b.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://lakiluxodev.pbworks.com/f/88303180160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90ff970-fb83-4db4-bc58-0caf92891756/40932395445.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144503034/caveat_format_in_marathi.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/f/dumavakajixojotunidej.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/botinafiv.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/caucasian_chalk_circle_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd61e06-54fd-4ddc-90bb-e38f745ff78f/best_online_real_estate_school_california_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414ec1ba-da43-4bfa-ae6c-35b36f06c421/45248850302.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/how_to_fix_milwaukee_m12_battery.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144446247/does_trs_detox_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55cad22-277b-4a3a-b198-3bc438ff7c65/how_to_perform_istikhara_dua_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bf4f29-20ff-4fbf-8437-4333cd30ecff/lugimabewamawufuvubususe.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/xokuxivuwuginalizag.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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 4728 bytes
SHA-256: 2dec20ef8b58626a8e5307f61cbaf497def6819991433f0ca86d725f909fe9bb
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10136 bytes
SHA-256: e5dad81900b5d07f6b131b4a47079beaa50ec0bdac8f2d33f7e2a88a47a226cc
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3