Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bfcbcfb1f8262a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-10 01:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 142ca5ab512ce7d055515cc81da94fad SHA-1: 81e94af6094f8c706b1a42ab203c4205650647fa SHA-256: 44bfcbcfb1f8262ab6c25fcd68ac46f49ad5081c055ffefaf8bcd4504677a487
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used in link farms or phishing campaigns to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=inverse+functions+and+relations+worksheet PDF link annotation
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/a4b65745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5ff39d572063c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5fc765c9ec07a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fe3138abf62b.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/which_sig_p320_is_the_best.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fe86c0387a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_60464bf22cbfa.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/984504200140a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_6005b4dc9fdd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_603c2726ad7bb.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/1677125.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/550b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ffcc56e16f66.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/peliculas_mitologia_griega_dioses_del_olimpo_en_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421477/normal_5ffda8834ded7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_5fdbfc552349d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumepenitujox.atwebpages.com/cajas_de_carton_english_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8850a4ec-9671-4619-8bdd-59db83f4e5a4/jalefeboduxixafa.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/81289735021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1c6a91-1b76-4c2b-af30-ab8881b4f67b/noneregivogavofovolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341a2460-ae45-401c-9f35-a438c49dc025/83181965331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f815ece4-1106-40cc-9ba8-cc9e5d482e4c/zamadaf.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/bed_sheet_chadar_ki_design.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/axis_direct_cdsl_account_closure_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/power_book_11_ghost_episode_11.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_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 5260 bytes
SHA-256: f4326ec49dff7572204dd08304d4eb37e3614aa87c21853470ffb4786a28054e
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 10736 bytes
SHA-256: aa24e62fd1f476826328b3fd2af627b22c0ae586699009f93db33a514d467554

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