Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a40f0e47c15c0b9…

MALICIOUS

PDF

78.1 KB Created: 2021-04-01 05:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 28c80b354b06601fbc55ab3a84fb632f SHA-1: ca49e79dc3ee872644219129ea876412caf16954 SHA-256: 4a40f0e47c15c0b97140dfb24f2d90393b9b8c9e012b346406ad32d7e7d2258d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/award?keyword=search+engine+optimization+bangla+book+pdf+download PDF link annotation
    • http://xemisudufi.iblogger.org/66430606736.pdfIn PDF document text
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/katofuduwoge.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/jgMjcnk/flyers_poster_maker_graphic_design_banner_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/ibmijEl/bilipijuwoduwusuzemadusu.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/8232145.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/Vgjgeig/zewadafitapulezatuz.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/5jefdGU/international_travel_checklist_template.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/bZgijVa/train_driving_simulator_free_online.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/04c0a9084.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/50696013-b660-4096-988a-345e28557fb9/ganamrutha_bodhini_buy_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/awlcraft_2000_product_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/18090551326.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_0ebc7fc303474e3b9f27a074a2003c0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f1e542-3c06-4b2a-867f-f1fd982d92bd/fovasukekidikagulu.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_7132d2ca4681431d8b752b2fb3a518eb.pdf?index=trueIn PDF document text
    • http://jebufatibakuv.epizy.com/gnostics_gospels.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/checkpoint_firewall_interview_questions_with_answers_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/bodycon_dress_formal_dresses.pdfIn PDF document text
    • http://rebukupomapet.rf.gd/klasifikasi_cacing_tanah_menurut_ekologi.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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5840 bytes
SHA-256: 0de1959ec854434ed60b6f0e343231a2ca69fd5ae0b13008ff81c89f2d301a23
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 11064 bytes
SHA-256: 12dc4f3273b63aeb51d2e3108b037e0308b0c4cd24e5a684a4d99b1cfd97ec66

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