Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c3d8aaa22f9ca0…

MALICIOUS

PDF

77.8 KB Created: 2021-05-27 03:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ab3081d7edfad7ee73ca34caba24bea5 SHA-1: dab675ae667672630b9402319e8a89d5e725724a SHA-256: a4c3d8aaa22f9ca0a13bf1a5284f9defcaee9a5f60589daf48adc5338caa5723
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=quanto+custa+uma+sess%25C3%25A3o+de+quiropraxia PDF link annotation
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/gixezobekusadavelaja.pdfIn PDF document text
    • https://xagajopudulu.weebly.com/uploads/1/3/4/6/134697977/ee83b6.pdfIn PDF document text
    • https://kujiguvasate.weebly.com/uploads/1/3/4/5/134584602/pigusin.pdfIn PDF document text
    • https://xojenupikubola.weebly.com/uploads/1/3/4/7/134747345/wuwepozepof_doraxa_rotagemo.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/puzakobuxowakiwunifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_600df744d4071.pdfIn PDF document text
    • https://basalusorur.weebly.com/uploads/1/3/4/6/134661810/7398548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fe5e8c12cbaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_6051e2328bbc0.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/004ef55afcd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_603817a10abd7.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/xanizogapalu-fadagur-xaxisopemejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_5ff209a122495.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/mitegakokimomida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_605306c4c7f9c.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/a3573530-0c15-4b8f-9daa-3cde4d5a0a09/44031044722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdbf142d-5127-42de-ac00-a025666cd53c/dumopijerulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a785d847-f379-4f62-9370-c30787b5286c/honda_eu6500_generator_shop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65eb8d1-e467-4741-bf1f-e853de4b7627/walmart_black_friday_tv_deals_2019_65_inch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0220459-45db-4571-89b1-1d26cc575143/want_to_fall_in_love_with_your_partner_again_36_questions.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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 5760 bytes
SHA-256: 3b3f8a1f1e89ee6e48402bb8a2260580db3733c38a2d816410fe893bfbd58bc5
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 13428 bytes
SHA-256: 449d3c2671af74584c6fcb922773d218549a5906b15207f5bbf28bd4efac0e43

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