Malicious PDF — malware analysis report

Static analysis result for SHA-256 50496e3aaf182680…

MALICIOUS

PDF

78.4 KB Created: 2021-03-13 23:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dabea38dc2a00c59d05682e9b0880a6d SHA-1: 33c571f21dde9c0686054ff547fdd0b7703b9345 SHA-256: 50496e3aaf182680aa0a86a0787cd2e21601147faa55f0702083f75f381fc167
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=sears+kenmore+canister+vacuum
    • http://stat-index-co.com/rohinton_mistry_a_fine_balance_audiobookgv7lc.pdf
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/9dfdb875f.pdf
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/ade20.pdf
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/nupob.pdf
    • http://vobugefu.22web.org/juxefawivatub.pdf
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/3f14457.pdf
    • https://vokufasel.weebly.com/uploads/1/3/4/8/134872836/juxobojujewitosova.pdf
    • http://cashthe.ru/9124857207wydec.pdf
    • http://instacopyrighthelpteam.com/que_es_el_pago_en_titulos_y_operaciones_de_creditoigs6e.pdf
    • https://nodopotol.weebly.com/uploads/1/3/4/0/134018708/newidiwatobudobuge.pdf
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/74d5a17840a3.pdf
    • https://vinazova.weebly.com/uploads/1/3/2/6/132695356/gosov_xopebojosufadan_forosowe.pdf
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/9501827.pdf
    • http://4338bacchus.com/advanced_mathematical_concepts_book_answersn1els.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0011f7a6-dcbc-496c-a1c4-c9a9002ba485/vomezoru.pdf
    • https://s3.amazonaws.com/pasawe/clorox_disinfecting_wipes_material_safety_data_sheet.pdf
    • https://s3.amazonaws.com/risalenefazozo/beetv_apk_fire_stick.pdf
    • https://uploads.strikinglycdn.com/files/71c708e8-b8ba-4dd9-ac52-f1a800e43de4/paxukeb.pdf
    • https://uploads.strikinglycdn.com/files/390dc419-2c0e-468f-9b3f-59602eca9a71/33068014088.pdf
    • https://s3.amazonaws.com/gomaxod/25937835845.pdf
    • http://nivobilov.epizy.com/51163646083.pdf
    • https://uploads.strikinglycdn.com/files/66705b4b-fc89-4e63-82a3-feb1690d8932/58857716378.pdf
    • https://s3.amazonaws.com/rirusozo/gudabomaj.pdf
    • https://uploads.strikinglycdn.com/files/2fb7855a-63e6-4245-9584-f01b9f59fe9c/how_to_cook_a_roast_in_a_pressure_cooker.pdf
    • http://sevetise.rf.gd/92842292613.pdf
    • https://s3.amazonaws.com/vazisi/96145768078.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f858.bin
88a61d4450be694ddeda618cd31c92bdb483d1dee7d0fa07652908aa48241675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 5140 bytes
font_01_sfnt_off000109c6.bin
818a56d4aeb2ea8cc02699f7e9f8f6a4c4f61c1fcbcf5690e6e2ef43a50fc781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 10052 bytes

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