Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b93e130d650ca54…

MALICIOUS

PDF

78.1 KB Created: 2021-03-06 12:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 67071fc70205a9290ee42189aced8b13 SHA-1: de985319cdf5e25c6177175ffcbae5c5ea232603 SHA-256: 1b93e130d650ca5480376782d856ca1d488858f12dc116ba6029c07710589e32
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting and potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=how+to+remove+ink+tag+store+left+on PDF link annotation
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/javibi-watewav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483071/normal_6008eff6b978d.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/mebixizi-povipoputila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_601ac6ad1bbee.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/6973214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_60104a01b52a2.pdfIn PDF document text
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/wekavilatuzugowixu.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/jilasagodos_povuzewom.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/xabifotikata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevivudawof.epizy.com/17095242772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e00d15-8145-404c-8094-4d85841be4a2/talez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a219ed-a583-4028-ae37-423c1764bd79/roald_dahl_the_witches_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d7af03-62fd-4033-b9d7-adba6fabeafd/zomakoxoxakaropog.pdfIn PDF document text
    • http://nudobovedazopor.epizy.com/traditional_vietnamese_dance_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f8fce6-a5bb-4eb7-abf3-e2a7a8622154/tunodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a05826e-7cd2-4934-b454-2f3f808363c3/nokusesubiron.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/can_you_change_the_temperature_on_a_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4faa3126-7cbe-4642-a3d3-3352c324c18d/92806653728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd18c17-637d-4a2c-9749-e11d15ed7276/el_hombre_ms_rico_de_babilonia_audiolibro_descargar_gratis.pdfIn PDF document text
    • http://xaligapuk.epizy.com/16556215253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87eefa20-7d7f-453c-8296-204a735d9710/zibetodimolisizugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ecce1f-7809-48e2-9fdb-fb4791d1ee71/group_threat_theory_sociology.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5264 bytes
SHA-256: 50015f54b41c33b281d82c80a3f6502fc82f3b10e233e8bcb65327137e4ba4da
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 10656 bytes
SHA-256: 39117214c8a90668ca44a191a22ae1bc9f8381e9edd0ff46f478ff09c2fda472