Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1ae0ce0bc00bdc…

MALICIOUS

PDF

87.1 KB Created: 2021-05-28 12:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 04528ee5e335a7e0c6a16cfb1285b783 SHA-1: 4d491a0ca965ece30b64b4c7db72214e53189a91 SHA-256: da1ae0ce0bc00bdc3758dcd7b6f0fe7dba4d7d5f331dec21aef9196e5fd11038
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://botokaw.ru/123?utm_term=crestron+tst-+902+datasheet PDF link annotation
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/08f8104ea259ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_604dcb137e337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_603ffb539257c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5fdb2942f1de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_5fd098a7d40e5.pdfIn PDF document text
    • https://jikanozirupeson.weebly.com/uploads/1/3/4/6/134656521/sulipepufema.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/4516045.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/gopoxuxiso.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486981/normal_60afe6742398b.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/f09d238f38c.pdfIn PDF document text
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/caa619f23ddc8d.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/bexeduwep.pdfIn PDF document text
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/rujapubiwejubiwi.pdfIn PDF document text
    • https://wuraruxirike.weebly.com/uploads/1/3/1/4/131453605/zodagekedin.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/sifure.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/fa37159d214e.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/5229612.pdfIn PDF document text
    • https://zumokijux.weebly.com/uploads/1/3/5/9/135966910/kupigudobed.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/3fe952e2-77af-40a5-bfce-64a655b0c27e/wewesuzepukubafir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f83bc3a-e74a-49c0-b79a-c02136b5bf6a/hill-rom_pmjr_hospital_bed_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff49e96-b4aa-4fb8-b352-93d36f5591ef/boveromepojogijivokane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98f0ab1-de72-46e7-a637-23d3c79ef354/xizifetavowowafodu.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_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 5248 bytes
SHA-256: 27aeca7eab3d3e739ba702cb5e23231b277c7bb671958fb7929549454feb860e
font_01_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 10692 bytes
SHA-256: 7ced5832f568b98f02bce9e8d50646365a40fe1a63d18b099743a31c40a083e7