Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ed828349afe971…

MALICIOUS

PDF

74.1 KB Created: 2021-04-03 12:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 27d948b8b0da4794ade0da6e081fa7aa SHA-1: 33037d3ed0c53b5888247e221c468a62f13343c2 SHA-256: 65ed828349afe9716b6df5643d4186f5eba4d01380ba41832f8623ee073d9081
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs and the PDF's structure suggest it's part of a link farm designed to distribute 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=analysing+financial+statements+for+non+specialists+pdf In PDF document text
    • http://13millions.store/13841774739t4xja.pdfIn PDF document text
    • http://comp-arenda.site/21008903426sywtf.pdfIn PDF document text
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/garuniximeku.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/bofigevitotivap-tupomipe-jikovibukogotu-kubas.pdfIn PDF document text
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/lakigonun-kiwodanopufoxus-kejul.pdfIn PDF document text
    • http://hangzhoumetal.ru/broken_screen_app_freev6tld.pdfIn PDF document text
    • http://eushopvmn.site/jatumofxnqaa.pdfIn PDF document text
    • https://zidukatuf.weebly.com/uploads/1/3/0/7/130775563/a7e7bfb4a1.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/vuxofafumerafusaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/fimugimodetapip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1842068-0c9e-4c34-b68b-dd0a073ec03b/rojokuvesowusebakaguje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da90b770-86d0-441b-82a7-cf57a9c885d4/analisis_del_libro_cien_aos_de_soledad_personajes.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_586676849bc74ab2a0a3939423f996f6.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_89526e3e835748389e48d17b59d92422.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0854e6d-1f42-47d8-b8fd-f07f42aac038/sezawotaxaxavukupevuxivu.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_3159e97830d244fdba9cf9ec0abdbebb.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_81b1374da9414c7799552c82bc870152.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/kepitegejizemiwemoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cc4407-feb8-4bb7-9bf4-99ad5aca9208/56908236614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4465e3b8-99dd-4147-ae03-8cb72f8ea5e9/biroki.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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 5564 bytes
SHA-256: 3a98b257fe47abe489fb77da24bb641a791c7bd68af3a10ef47cdf13f9adefb3
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10220 bytes
SHA-256: c3cffbc80ebfb54d04563190e31144767533f8fcc1d4ceced0682389aec56773