Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca360ab0c3a8283…

MALICIOUS

PDF

73.7 KB Created: 2021-06-09 08:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 770b2f950c58e2f7ad0215950e0ab15a SHA-1: 3d181babff171813f60b74592cce19d42a245adc SHA-256: dca360ab0c3a82837c3d71a383cefec39b38be4ea10091214c3348d56d62c8e1
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, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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://chcial.ru/pbw?utm_term=polyatomic+ionic+formula+writing+worksheet+answers PDF link annotation
    • https://dukifuti.weebly.com/uploads/1/3/1/4/131437117/f26cc3d749d2a.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/rodufifit_xopuke_wiludaz.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/bd359.pdfIn PDF document text
    • https://degivuvexopuma.weebly.com/uploads/1/3/4/8/134858753/wewuv-tonokemimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_603c571699b15.pdfIn PDF document text
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/245444.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476418/normal_60affb9c6f6f1.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
    • http://saladolu.pbworks.com/w/file/fetch/144589935/fundamentals_of_geometric_dimensioning_and_tolerancing.pdfIn PDF document text
    • http://zikasamu.pbworks.com/f/autodesk_inventor_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7b17f6-2bd9-4f4f-9f69-1129289973b0/new_punjabi_song_2019_mp3_download_djpunjab_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f41672-ade3-428c-8219-d2585f514fec/joxorupewibabibobitaro.pdfIn PDF document text
    • http://wipadewor.pbworks.com/w/file/fetch/144801930/rujoloseloweguret.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/xagoboduwato.pdfIn PDF document text
    • http://tedadopite.pbworks.com/f/pojapusevijolojofegenujon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d4d465-ed29-43a1-b411-06f11a4454a4/miniature_dachshund_puppies_for_sale_bakersfield_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23322d2-350c-49f9-a571-97a66266a285/zomifomezuloxewajarap.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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 5436 bytes
SHA-256: 95c5265ebe73d3ccf33eb3967ea04c654442f9538fddc6af42e09491d6ec10b5
font_01_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 10736 bytes
SHA-256: b45eb022de764a557b8f4d6ed8a95be6d216310752b4884203cc525ddbf8abf7
font_02_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2