Malicious PDF — malware analysis report

Static analysis result for SHA-256 058a58fbcd3d5d7b…

MALICIOUS

PDF

74.5 KB Created: 2021-02-15 21:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 28d43760d80a4738b86edd18e300b030 SHA-1: 57062d7a606da2e47da4594f3e48a732c69abf23 SHA-256: 058a58fbcd3d5d7b31227483bf9e67104f5b2a4c4a27d7c11b4d40fd9278b8c9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to direct users to potentially malicious content or for SEO manipulation. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malicious redirection attempt.

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://maypoin.ru/123?utm_term=how+to+clean+lattissima+plus PDF link annotation
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/2718449.pdfIn PDF document text
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/gosewile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_60048ab2939da.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/nodopemu_tutenuru.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/437087599905c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_6012ccec31a43.pdfIn PDF document text
    • https://tobakegerikudo.weebly.com/uploads/1/3/1/4/131482881/jawitimuvine.pdfIn PDF document text
    • https://favotofuti.weebly.com/uploads/1/3/1/8/131871633/jakomum.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/6875761.pdfIn PDF document text
    • https://kusezobovezuzeg.weebly.com/uploads/1/3/4/6/134689385/jojevutuniv_gatomisofuz_kanesavidelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_600ff17d522c7.pdfIn PDF document text
    • https://tejaxoxujita.weebly.com/uploads/1/3/4/3/134368030/runimazowas_devara_varatexadi_jozes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fe59873c5665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_6017237d9683c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wixamupelinere/cerebral_cavernous_malformation_hereditary.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/zinunivifoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/visa_questions_and_answers_for_us_f1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 4920 bytes
SHA-256: e9b997c0e7a4b5303fcc6d199adf6d5fd8ca0725917a8ccaf7c11c581d108c1d
font_01_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 10212 bytes
SHA-256: 4453f99e22cac448ed4b7df951f2629a04b7ba720682df998cc2f4f6bfb68cd7
font_02_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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