Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fd40dec29d7082…

MALICIOUS

PDF

70.6 KB Created: 2021-02-22 15:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 74c0f104ae728243e03aa94d11603fc4 SHA-1: 86060f3b942e38fc373282303328e567f13f1e37 SHA-256: 56fd40dec29d7082a543c13890e3236a15ed6cc8da09dfbd227c22ef8f62f516
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to direct users to a variety of websites. The presence of a link with a 'utm_term' parameter indicates a potential phishing or scam attempt, aiming to lure users with specific search queries. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/123?utm_term=how+to+connect+samsung+printer+c480w+to+wifi PDF link annotation
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/muvegajuge-divuruduxulolu-tunezadifam.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/dHAvTjj/falejelavisakiwakabaxode.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/davixo.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/6814643.pdfIn PDF document text
    • http://perakaganiw.iblogger.org/how_to_fly_a_dji_drone_for_beginners.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/a714b19d8a3ea.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/hb6lFhj/herpes_simplex_10_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/jXjaiea/wivatatuxusevabuforun.pdfIn PDF document text
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/zurogesixeruveligile.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/55957.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/chdMjeH/62020086260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losikamadan.epizy.com/78878141707.pdfIn PDF document text
    • http://kebanibaru.epizy.com/what_bones_are_formed_by_endochondral_ossification.pdfIn PDF document text
    • http://wudobez.rf.gd/xijodipekupulezejet.pdfIn PDF document text
    • http://gasezeru.epizy.com/cyberghost_apk_premium.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 5780 bytes
SHA-256: 6d424318eef3e2e91be77f9ae1e360d1dd67004a41f58d258a66500180f240f1
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 10768 bytes
SHA-256: 32ceb8f123f9cf849fbfd3d9c36af15335b7c2250ede6d3af1e49bbf816373fb

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