Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d666d6275710e66…

MALICIOUS

PDF

72.5 KB Created: 2021-04-06 19:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01b506d48c9e79b457e905d35fbe0b92 SHA-1: f759dffe0ad2662173bff690d575fb55aab6c39a SHA-256: 4d666d6275710e6689c9038c4749ac96ab1ebd994cc0697ae209384f6078d569
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or malware distribution vector. The file contains a large number of external links, many pointing to disposable domains or suspicious URLs, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs are indicative of a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=lagu+bidadari+tak+bersayap+freecoustic PDF link annotation
    • https://cdn.sqhk.co/vadavenaw/cjXVlie/peruvuru.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/mezekaruroponiwa.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/taxawotifazesize.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/igNginU/sanic_theme_loud_roblox_id.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/41014228518.pdfIn PDF document text
    • https://leresawukulet.weebly.com/uploads/1/3/1/3/131384076/4426959.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/alexander_s_empire.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/JicjhsM/totaxije.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/xejelivuxuzeve-vatefaxofevesov.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/ruvatogebo-bedupukevijeni-mobagemiwirore-nibumu.pdfIn PDF document text
    • https://sedugewevazan.weebly.com/uploads/1/3/4/2/134234752/tilamaje.pdfIn PDF document text
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/jejisepijakudu-dotowamu-paturenadowipig-sekokirejazudub.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/4f81b26b-5f77-496c-bac8-c16ca4d85cb9/viruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fa5d1b-0370-4e55-97d0-5112cdda279f/yamaha_mg124cx_stereo_mixer_with_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/armitron_wr330_change_from_military_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f021eae2-ca11-46d1-bb0c-81655efa575a/85896264317.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/pogumonu.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/abdul_qadir_jilani_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94bfa76-d720-4039-8646-ac0be1370da9/plantronics_voyager_pro_pairing_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff01f3e-6944-4718-9b8a-8e2e8cae86db/what_is_the_ip_address_for_canon_printer.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_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 5312 bytes
SHA-256: e5ed5931ba8234807fc2f9cf19e4fc79c02ce1931409acffd9e8923d04024da3
font_01_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 10272 bytes
SHA-256: a48e4733c20b9fa818f1319be1e248fa89de545cba34a63ecee153e574402be6
font_02_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34