Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb22b51facf01211…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 11:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 790d2c54377be015bdb09dd95af0d2a6 SHA-1: 1fe29fb00a6c2cfee27c6eba97a0aeb553f3bf19 SHA-256: fb22b51facf012112addc5bb3cdfb88c47274640f55cd551fc03dbe2e7b03eb4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The embedded URLs, such as 'https://bologen.ru/award?keyword=straddling+the+line+jaci+burton+pdf+espa%25C3%25B1ol' and 'http://nujagexurej.medianewsonline.com/87164711407.pdf', are key indicators of this activity.

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://bologen.ru/award?keyword=straddling+the+line+jaci+burton+pdf+espa%25C3%25B1ol PDF link annotation
    • http://nujagexurej.medianewsonline.com/87164711407.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ffa091ae3125.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/NhhvLwg/68363578685.pdfIn PDF document text
    • http://sandwichhq.club/hp_laserjet_1100_windows_10_usbj5m0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_6029b1b6e4387.pdfIn PDF document text
    • http://kzrovk.xyz/writing_comprehension_worksheets_for_grade_5wr7j6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600b1e9789aa7.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jhiA8ie/puwerazosim.pdfIn PDF document text
    • https://tositoda.weebly.com/uploads/1/3/5/3/135312816/1f9e4e8.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/xotavex_gidom_vilogozepelafi.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/katexidud_jabidutuda_bipete_fukifikomub.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/pSvVWIu/42562111178.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/fesedarowatepomedorel.pdfIn PDF document text
    • http://domastmsk.space/nofufexiboliralerozewulut1uy7m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_c6ce9ca8267c4c69ac06798778d087fd.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_43fd824d7cfa4c0d820c8cf18801d086.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_db41dce58a8142548366cac4e50c4f42.pdf?index=trueIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_38f3cf6854834739a65b8c76ea2c777e.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_b5eb8a1d0baa496a93cc888050b4423b.pdf?index=trueIn 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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 5948 bytes
SHA-256: d829ba7d4e1b07ad5644ea11c79629c28e47d3030880ff4c3b842a81bd20b47e
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 11336 bytes
SHA-256: 578d66c38ee2c5f43709b7dd16f70c9e233f3e4adc5e8ffa93ed774b475ce585