Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e97b6174c150e22…

MALICIOUS

PDF

75.5 KB Created: 2021-06-10 18:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4ca7bfaf740659d2b52bb986bc88d6b9 SHA-1: b62bd684f8062fead7828854bb0275113bd8cbf6 SHA-256: 4e97b6174c150e2238d7e181fbe15c366c7047c89f39ee9b618fc78e35841fe2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/pbw?utm_term=123+movies+hunger+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467005/normal_60b7a0819f578.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/senisoxuk-funugimefizanuj-bavipakup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_601b4bab23541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403822/normal_5feff1746ef5d.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/0f7a1f1e64.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/2201838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_604da314b0128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fe1906e61719.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/71228994-cfaf-4c17-a8e4-2f077c2a3d37/21270139143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429c309b-146d-4363-a46b-ad4f17e217ff/how_to_replace_bose_soundlink_ear_pads.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144507612/86903067064.pdfIn PDF document text
    • http://pajajafilexe.pbworks.com/w/file/fetch/144748344/psicofarmacologia_para_psiclogos_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9fcc86-a681-41ac-bdaf-5de812a716b3/best_programming_language_for_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68421029-3a1f-40c3-9f3d-c40210f56121/new_john_grisham_books_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e588ea96-005a-44ee-8b5a-49b86f683cf2/hoover_max_extract_60_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417efc73-8fca-47c9-9a75-82f445a4e51e/43047883759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2943ff79-553b-41f7-8373-490136f0b4a9/mercedes_e320_service_engine_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fa042d-ebca-4d6e-b7bb-07a5291aa35f/sintomas_de_trombosis_venosa_profunda_en_el_embarazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577010f0-8f50-44b6-88a6-ad17a99f1633/6336448131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b7bcb0-4f23-407a-a132-5b574b40a39f/bohemian_rhapsody_guitar_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f1b1b3-c041-4191-b431-b0c8ba6dfd78/rizazitijuxetoluro.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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5380 bytes
SHA-256: 72601d2945d8d6105d1263c0d16cf0cbd24a06624bf0cd98f8e49b42608de7d0
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 11148 bytes
SHA-256: e656d2be2bccd8cdd47f6066b2448f4eab437945af2f26602c1366ff16d9085b