Malicious PDF — malware analysis report

Static analysis result for SHA-256 159faf6e9b021c4b…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 07:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0630c51fb9aa0aab51c0f84d701881a4 SHA-1: f694f8c42bb87deea7c8d6b45aed2b3028ba4e79 SHA-256: 159faf6e9b021c4b6b7d33eeecbfbc72c313614e4d72b0cdf30b0a999bbe9c17
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://kuzutuzo.ru/wix?keyword=munay+ki+manual+pdf+gratis PDF link annotation
    • http://i12tws.website/cuban_love_poems_in_spanishn47la.pdfIn PDF document text
    • http://dazenad.iblogger.org/84295719937.pdfIn PDF document text
    • http://lowwsaw.xyz/84688347610diq21.pdfIn PDF document text
    • https://tumofevex.weebly.com/uploads/1/3/2/7/132710745/6861489.pdfIn PDF document text
    • http://soldonlittleton.com/namibewukaykrwz.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/nukitisaduguliw167x0.pdfIn PDF document text
    • https://rimibike.weebly.com/uploads/1/3/4/6/134636102/vumazomeborotonu.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/perkembangan_agama_katolik_di_indonesia.pdfIn PDF document text
    • http://jejederepox.medianewsonline.com/zuxufek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwajip.epizy.com/frindle_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9441199e-231c-4589-b195-1a6dba54f85b/fizezejevirar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f670caf-de75-453e-addc-cf292c52680e/tesulezepoxidape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755b2908-66f2-46e6-a319-a1f5dac6399a/march_2020_makeup_releases.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/fundamental_trig_identities_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/amarakosha_sanskrit_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ad45cf-5844-4593-856b-59bc5a3e2f5e/girl_interrupted_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165c95cb-8011-49d8-92cb-e42ecb0104f1/74883672687.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/indirect_speech_with_modals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/98486285237.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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 5532 bytes
SHA-256: 7e03b824006488985747bfb0d58cbe0ebe9e33234eca6ef3088f2785a02949db
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 11212 bytes
SHA-256: 4ef03d8dcd1afc804c97084f77c4d3d2f0ceef0403a2591e0fb6886d0597ebbe

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