Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dead0e723ce805…

MALICIOUS

PDF

79.2 KB Created: 2021-05-31 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5f6585646de84f512495f3eb829cf142 SHA-1: 2031fa80ed61466cc916b608327944f20ded3c7c SHA-256: d5dead0e723ce805b6afd72870a08559bb998cfd1907f9fe6176931b6ff34242
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the presence of numerous external URLs and the PDF structure itself point towards a phishing or malware distribution scheme.

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://resalured.ru/strik?utm_term=un+dia+de+quehaceres+3a-2+answers PDF link annotation
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/numiba_zolanumuxome_kavuz_zigapa.pdfIn PDF document text
    • https://vafubetuxako.weebly.com/uploads/1/3/4/5/134503762/59636.pdfIn PDF document text
    • https://vidulegu.weebly.com/uploads/1/3/4/8/134897898/2a029844dfb16c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fe4073de385e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fca6c2dd51f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fe77dc7d39e6.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/2817990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6040deeaa0a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_5fd94697cd296.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/b497a25ffc291d.pdfIn PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/vigabuzusujepew_zakot_somupedoluviwoz_goburumujitope.pdfIn PDF document text
    • https://belawutuvuzepim.weebly.com/uploads/1/3/4/6/134605506/runexusave-genemofoson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fc92ac03ecc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5feb80059c7d8.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/9b49782b-1060-4195-83d7-6c76c5267a40/how_do_i_update_my_american_megatrends_bios_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503c0ea2-cacf-41ed-b182-bb0f74149a1d/how_to_program_samsung_blu_ray_player_remote_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f26918e-8fa5-482d-98d2-f763c03acc16/40207619288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b09b22-d66d-4ed4-a734-e61362a32f50/xidajajidiniboxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5294ab6-c313-4d2e-9fd1-5bc9b7fe23c1/zazafipifomave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d37aa6-577a-4361-919e-ad0c50e79eba/38729274175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265881ba-a687-437d-991e-c497b1c4f969/78152340429.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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 5224 bytes
SHA-256: f80b5ea427a0cd67c8a876ae44bbedc26315ff327684cf9274bc346ad07bdbb8
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 12100 bytes
SHA-256: dc666b6577fd42299d9b1cb908adb4273a21e473e59a002cdee9234196532d70
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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