Malicious PDF — malware analysis report

Static analysis result for SHA-256 16990cd3f2ee7d32…

MALICIOUS

PDF

92.2 KB Created: 2021-05-26 18:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 270167f5b3d20d73ef4cd6b93153a088 SHA-1: 297455e63a00a3dd1842839061745c662da79158 SHA-256: 16990cd3f2ee7d32b13283f36942d21a9ce75705a04598346d572ca7ac8e2573
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

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://lozipotod.ru/strik?utm_term=how+to+make+copper+shine+at+home PDF link annotation
    • https://kelukija.weebly.com/uploads/1/3/4/3/134337818/nivete-tobimavox-finumil-pimufosuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffe9e53e435d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_6039e10279649.pdfIn PDF document text
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/86bea.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/wunudapop_fagekevip.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/5920322.pdfIn PDF document text
    • https://majawisalopor.weebly.com/uploads/1/3/5/3/135300577/vewasafal_sobeturururema_tugosexukebu_joxivaronabugo.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/wasamirekude.pdfIn PDF document text
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/9669033.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/731dcb6f-5e6d-44bc-97fc-c010b2b3aa86/supersonic_tv_antenna_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c4368b-5727-45ee-80b1-29aa6a27a151/44883882166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073ef129-b258-4677-ace7-cc9947f36db8/52485798202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627ad7d3-27cd-436e-8753-d7f14ee97e37/new_yorker_magazine_artist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d418b6-f559-479e-adac-a295612f7cc0/48153611155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2140d1fd-470a-4255-976c-7be8f87c5e07/78784409108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1324262-2c6d-4e53-9b19-3c25a40e9562/10773121046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24cf4ec-6287-49e3-a9dc-34bcff81aa8d/99287540584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc00c91-a7e6-4b43-acc2-86eac2dde2b4/85245633278.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_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 5044 bytes
SHA-256: 5d2d838f539aa3f19783668fbef769be28668ce386d8a2ec692f99fee3d5f959
font_01_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 10732 bytes
SHA-256: d4b42e4cd39eb5020b81a57b194cefc9dd8177fa06430cd21de7783f46c1dba7
font_02_sfnt_off000155a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e