Malicious PDF — malware analysis report

Static analysis result for SHA-256 50920964035c0474…

MALICIOUS

PDF

94.9 KB Created: 2021-03-11 09:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5093aea073f52176a05c10078613cdf2 SHA-1: 1a0723fc888c8719619c5b59c361dc4b7e6b359d SHA-256: 50920964035c047493fc69f852a0c535794a7e0006f994c8b2e475e1fcb44686
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/award?keyword=laporan+pendahuluan+unstable+angina+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379970/normal_6049553bbfb37.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/99314.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/1948009.pdfIn PDF document text
    • https://fabofosozani.weebly.com/uploads/1/3/4/8/134870462/2792969.pdfIn PDF document text
    • https://likunemotiro.weebly.com/uploads/1/3/5/2/135299998/412a829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fce0eff647a3.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/e2aab8c2d1cfaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fe73084a8b68.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/tupuwovotane.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/19398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421471/normal_5ffad8586fb54.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/09d6138a-0fe2-4643-ae6c-fa91b8bd3fa4/pavuxivadolovululiw.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_ee71ef519aab4599a229c761b27a7808.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_f742a5f3fc2a460f8a4d783013762e43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fd2ea3-c27a-488d-adf0-30085a62ddeb/lunirof.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_178696597a0c462f96e2be3f8166bde8.pdf?index=trueIn PDF document text
    • https://eeebefec-a839-4a3a-9f85-40791d64ec9d.filesusr.com/ugd/4cd51e_e1cad2479f3a4daa9d1d5435f71c441b.pdf?index=trueIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_250dff41161042b1a475edfe7e406f0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1a94d6-2465-48b1-aa58-b9955b5b93ae/french_vocabulary_quiz_advanced.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_1a146dfea1464f7eba172ca2dff725dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f541053-2319-4274-9d6f-b28942ee54ae/what_is_computer_ki_definition.pdfIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_c1593da564d247458178f7f62aa51567.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2498b38a-622d-46c4-a9ef-803b29acd49a/how_to_add_page_in_wix_editor.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_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 5264 bytes
SHA-256: 957681b78c4923804314e78c378166be6011551a7209c9dd031bb41fee9c77ab
font_01_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 10584 bytes
SHA-256: 22d038b00ac6454227bf159c7371cf5b212f2228d94f142e7eb03d427dfbc23c
font_02_sfnt_off00015fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f