Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fb7209b7a518b0…

MALICIOUS

PDF

76.6 KB Created: 2021-03-25 04:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6fd043f1974b5cf2465195bdfd9b3126 SHA-1: de0ecf364ca94edddaa85c8f468b7a80d60b1ef5 SHA-256: 28fb7209b7a518b09d4fa985cdd8b831ac09c422479003508a9c51eff3e7eb27
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/wix?keyword=touch+of+eco+solar+string+lights PDF link annotation
    • http://justamorem.com/free_printable_planner_2018_dailye5j2z.pdfIn PDF document text
    • http://trokot-shtorki.online/lutozix5pv9y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_5fdc6f36bcbf1.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/analytical_chemistry_notes_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6050a7e10d4b7.pdfIn PDF document text
    • http://familyit.pro/what_is_the_best_drink_at_kung_fu_tea3oysc.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/vobivukex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_604d8b64d2461.pdfIn PDF document text
    • http://peludofnor.fun/remove_duplicate_cells_in_google_sheetsqv5v2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_601b036fad04d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fdc0062bfa14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388824/normal_5febf1735f1dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_6034c1b56bc9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ffc68eab837e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fb921a-4e1e-4635-9879-6433599f879e/can_the_battery_be_replaced_in_an_ipod_nano.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/universal_laser_systems_pls6.150d_price.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_7eb645ef030e4417bf854a508c40ad22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f82f17-e163-41ab-af10-c9eb6214039a/bofuri_light_novel_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf45abf-5627-44e5-886c-70a9c0a9d464/black_and_decker_hedge_trimmer_extension_cord.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_bb147c1b1e3c4e06b30e611b5a037ef4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2ba461-c111-4928-abb8-8bb8166f041a/nalilexuz.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_704dfd41e6b14725b5776025db064a5f.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_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 5092 bytes
SHA-256: b8fcefa8317ddda7849bbe0ca4d0f59c474c1097773b7c9defe0acf42524512b
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 10820 bytes
SHA-256: 042289c1f65315a20e4de66012b3dfe297aa2aa646de144319579b1d81197d15