Malicious PDF — malware analysis report

Static analysis result for SHA-256 577d01275fb41373…

MALICIOUS

PDF

80.6 KB Created: 2021-04-15 12:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1f2a31e8b0242a38f59e82e49ab48d1 SHA-1: ad7d42dda494de53970f6fdeff31ed6075c23bf1 SHA-256: 577d01275fb41373ce85e6625d895b84346bcd697aa47b17ac024d5bc7314fab
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://baarspo.ru/strik?utm_term=arbonne+shake+recipes+with+cinnamon+roll+protein PDF link annotation
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/fb203450a8.pdfIn PDF document text
    • http://love-cosmetics.shop/hp_laserjet_p1006_driver_download_free3p5x5.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/kedalona.pdfIn PDF document text
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/5185907.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/pabomu.pdfIn PDF document text
    • https://lenonexijinex.weebly.com/uploads/1/3/4/6/134647177/gatenuvu-vuropewev.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/3f0faf6.pdfIn PDF document text
    • http://invitesistem.ru/gunn_diode_filenk5cs.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/db4b7.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/ignou_assignment_submission_front_page.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/094bc647-0329-4dfd-a5b9-94f6cf22e431/what_does_post_construction_cleaning_include.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642f123d-277e-4c63-a4a1-7772586f87b8/nosozazaxibamip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f28800-2fd4-4476-8ee0-28525b90997a/nupufusol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334f69e3-adc0-4c6c-a29e-18c6ed99914e/74717088328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e415efbc-00e4-4be4-864f-92e8b1f3baa0/is_sat_cancelled_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e453ac-1a41-4b39-8975-7e6b3c3bbbc9/65378455680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9673d49-655d-4aa8-9f45-f43bc6aac453/23610394275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bc4290-4d25-4777-af5c-9776e88ed294/79208491119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7192f7-c918-4fc3-ad40-3f8f876a9c86/50270025593.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 5244 bytes
SHA-256: e828cc628431e4ea83f3059a0d78f55ee2e9f7b05cdb504637de8b1128103cd3
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10868 bytes
SHA-256: a1c6915b73e027d9e94f174d5d51bed8b24efef7d2e2edc3d2c90ba1245b5c85
font_03_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2