Malicious PDF — malware analysis report

Static analysis result for SHA-256 13011b87aab0ae75…

MALICIOUS

PDF

80.6 KB Created: 2021-05-28 14:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 862eceef56955b4444d2b382a1545bff SHA-1: 718cd2043c950fbe1023cded22cb282b99002f36 SHA-256: 13011b87aab0ae75e2288165310c71fb7294b01888a006506e0d82457b23976c
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 pointing to disposable hosting services, indicating a link farm designed to redirect users. The presence of the ClamAV detection 'Pdf.Phishing.Trojan' and the ML classifier score strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=livro+dinheiro+emocional+tiago+brunet+pdf PDF link annotation
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/zesuduxoru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fdfc2b2c7d8b.pdfIn PDF document text
    • https://xeravatiwawu.weebly.com/uploads/1/3/4/6/134603636/3947539.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/4634225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387233/normal_5ff79b9e39898.pdfIn PDF document text
    • https://vunabiripiboxuw.weebly.com/uploads/1/3/4/7/134756527/movuxuvubekuzu-rogupur.pdfIn PDF document text
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/tonolezajokuxeb_sanerola.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/powomikolekuminan.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/2f97df02772.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/9762746.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/8519537.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/xikali.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/430d6f7f-3940-4275-826f-f6db33beb0ac/50050239909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066c665f-243e-4af3-a40b-177f932b932a/manual_canon_timer_remote_controller_tc-80n3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fab588-0d63-48bd-979c-46ae046b8a3b/how_to_lengthen_trx_straps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0cba87-b7f4-4974-82bb-7b3035ffa540/padunelokujik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3959d4d0-5459-451a-b921-ac3b474c7a26/what_types_of_plants_are_edible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d720e4-18c0-45ac-ae04-8465bf1f1203/how_to_remove_gas_cooker_knobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbbd0e5-b4d7-403d-8dbe-f625f98371b7/what_essential_oils_to_avoid_with_high_blood_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10937ecc-32e0-48d8-abe6-66c28dbfa11d/mobemoxizibafafok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bbe86f-3503-402b-88c4-e5d5ec3bfdec/when_did_the_game_of_basketball_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c21607-2640-4503-ba85-8cc92b5e9fff/42935006999.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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 5532 bytes
SHA-256: 29170252bd714e4bd2c14408a38d56bba23a13b92392b725e4ac2bb55b6d5824
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 13212 bytes
SHA-256: a5addcd2d3bfa6b21f6ed3a2130e4efd330b9ec7b95a419114e403ae4d04d96c
font_02_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16336 bytes
SHA-256: 92ca5277a07040a1118e6ffe557fff1b4332eaf15e577e4df2dfa25513d903e2