Malicious PDF — malware analysis report

Static analysis result for SHA-256 581e0d193e3724ff…

MALICIOUS

PDF

73.4 KB Created: 2021-03-05 00:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1beeffaed1f3b1ff2e2f8aac62d72ab2 SHA-1: 216533158370dd40bc62dd9d7c44cf9ba91507a9 SHA-256: 581e0d193e3724ff16041a74c1315ac32ecb85156084a5c378010a7a474df025
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a URL related to 'how to reset unifi' combined with the link farm indicates a potential phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=how+to+reset+unifi PDF link annotation
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/kuxano_varuzakumevexak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_602c428be2fdb.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/forubomazutinar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403818/normal_6000878e48646.pdfIn PDF document text
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/885ef14.pdfIn PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/0e9332bc.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/044700c0-c398-45c2-9344-de6f1b531635/hp_5610_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c583d2ec-6b8d-446a-986f-0fedb971926a/27547405779.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/wisabixugulumodovigab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01cd57a-1f59-4fca-9fdc-2d4713c1d955/73655797328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701b77c8-a25b-44aa-9df8-9ff1d13b6f6e/mojavokozuneduwokuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee18b36-58eb-49b7-a450-f624a9c2ffaa/lowrance_elite_7x_chirp_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bd5676-12f0-4e24-8089-2401374344b0/best_free_project_management_software_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2929ce7b-444a-460f-9ccb-1954d63c2bbe/how_to_adjust_brakes_on_1996_ez_go_golf_cart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f8d316-0c65-418e-a97f-4f871a9400de/43840129349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4854c5-2d11-40b4-b4b1-7f124d197e56/how_to_write_a_construction_estimate.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/zigujenuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f850ede4-0e63-43f0-8f50-d35cb308b37d/fallout_4_ps4_guide.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_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 4572 bytes
SHA-256: 97026ca88af307bec4d3230574e7a52a9611dd1a54bcddaf60f3afbc232f0d3e
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10964 bytes
SHA-256: 665a983c782db3542c6e74a625715f66139a510f4facf88ed77f281851c1fa80