Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5836720d9275af…

MALICIOUS

PDF

75.9 KB Created: 2021-06-01 16:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9405f123fb674fc13e63421825114e17 SHA-1: d15fca710d2b187cea93dcf7785f8a6fb67f2b00 SHA-256: fd5836720d9275afc938ede82808314e7db3b13205a707433e2fce430c4be040
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting services and are designed to appear as legitimate documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ClamAV detection 'Pdf.Phishing.Trojan' strongly suggests a phishing or malicious intent. While no scripts were explicitly extracted, the embedded URLs are the primary mechanism for directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://archism.ru/pbw?utm_term=actividades+de+agilidad+mental+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://xojovirasada.weebly.com/uploads/1/3/1/6/131637125/ruvin-vudagakaforuguw-xebopuseku-pikekunejuwo.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/19fcc7a5224.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/82de30.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/luzaxajeno.pdfIn PDF document text
    • https://levibezime.weebly.com/uploads/1/3/3/9/133986639/1809100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_601a2ebb57315.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/nifukebuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_604cd9edbd63c.pdfIn PDF document text
    • https://reroweno.weebly.com/uploads/1/3/4/6/134687099/lerozoxit.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/4a2143ae-b201-4c2c-88ac-a6deaa20d613/what_is_asme_b31.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144424053/how_to_download_fortnite_on_hp_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee677e6-455b-4ac2-94de-9f886cc30967/atsg_700r4_rebuild_manual.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/xivubem.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144426621/tinubajo.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/programe_tv_online_romanesti_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f4e0fd-8fe7-4840-a11f-3e8eb03856fb/civil_engineering_reference_manual_for_the_pe_exam_15th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ffe320-3ff3-4679-87f5-b5d94fe912bf/animal_farm_chapter_1-3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bec44bf-6396-4127-8134-4626989b0ab8/bijalemowigirejufekadi.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/w/file/fetch/144441480/lozowosodowofuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338ccdf1-ae2b-4354-9335-103fb726164a/wedejukifulifemida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44058b7d-754e-475f-846f-5cc40ed97321/is_curse_of_strahd_good_for_beginners.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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 5524 bytes
SHA-256: b4d7bf48341cef55544e864c23fd1fce7bb91e57b88615a7119d88ff2f4e81d1
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 11244 bytes
SHA-256: 6a857621ffbc4c4ecdaafcc4689e817bf291d3afda19eb25b68e7f977c2ab230
font_02_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176