Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c53bea8b278bb3…

MALICIOUS

PDF

79.6 KB Created: 2021-05-15 14:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3439297bd0a6c58d19a6c14d59a08c62 SHA-1: c6b32316b0a84538f1c53f81d97d9cb0302dd17d SHA-256: 73c53bea8b278bb3bda54d0d3121fa94035aeef16402daa283a40ef80de3db36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=how+to+fix+heater+switch PDF link annotation
    • http://texifudosino.mygamesonline.org/jekowibetosatabawojab.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/56207497884.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/jagisewi.pdfIn PDF document text
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/c1051914282f7.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/xiwikebuwet.pdfIn PDF document text
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/temimeninisawomo.pdfIn PDF document text
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/dufux_patulomuzep.pdfIn PDF document text
    • http://wemexuj.22web.org/82032554793.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/7496494.pdfIn PDF document text
    • https://zesajuletolif.weebly.com/uploads/1/3/0/9/130969916/0eedaab263b4138.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://uploads.strikinglycdn.com/files/ef7e8fc9-dfee-48ff-b879-0fe54f8dcaf8/vuworigukunupozuvotade.pdfIn PDF document text
    • http://dabirojab.rf.gd/how_to_take_ratio_of_3_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c12a44-dcbe-45a0-8d19-eeb464158c96/bejekusewidafazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6289a984-db4f-4812-b38e-5418cd845955/wisor.pdfIn PDF document text
    • http://tanijug.rf.gd/bavisagumigabis.pdfIn PDF document text
    • http://xepumobokuv.rf.gd/gomebasazomerovejen.pdfIn PDF document text
    • http://vemireme.epizy.com/nikon_d5100_price_in_ksa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172f6dc5-3fee-4fa6-8626-789f17a72aca/11221068691.pdfIn PDF document text
    • http://palulofegag.rf.gd/los_anelidos.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_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 4740 bytes
SHA-256: 64fe9e7b4908b803b59773d15765dd58d97a5e227a3ff703850991104594b2b8
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 11004 bytes
SHA-256: d35a3dd05554d3b90c0ea777ca429fa7215fbf64e986c6760725d3dfafc5004d
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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