Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5a78becb5cc644…

MALICIOUS

PDF

86.8 KB Created: 2021-06-01 11:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ddc50de72502746848ce8e62281a7458 SHA-1: ab84dbbac19d84436a497edbe07ffc5e02a3231e SHA-256: 4c5a78becb5cc644513b934ad81858ef634fbc7cfb9e182bc8ee5bda33be5c00
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attack pattern involving redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/123?utm_term=replacement+parts+for+weber+performer+grill PDF link annotation
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/lawaxepojanup.pdfIn PDF document text
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/3352582.pdfIn PDF document text
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/3774b04c.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/fanenorabo-nebawuli-bavugu.pdfIn PDF document text
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/lujatolufigufuwopofa.pdfIn PDF document text
    • https://pokeboxut.weebly.com/uploads/1/3/1/4/131437348/kagutizixi-narifivobujovox-lawopiwazudozo-vusedogefifovo.pdfIn PDF document text
    • https://pezulotum.weebly.com/uploads/1/3/1/4/131483557/899298.pdfIn PDF document text
    • https://zapedasavuk.weebly.com/uploads/1/3/7/5/137512880/4659053.pdfIn PDF document text
    • https://tazaliraku.weebly.com/uploads/1/3/4/8/134884946/fidukaj-fusikik-zusinurukexafer.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/1b72cd5f-5ccc-4d56-be17-be4b34be6c24/29119698115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fb16df-fb3d-4ea8-8bbf-b80dd497de9a/i_am_enough_the_way_i_am_tattoo_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b6cdc5-4694-4431-98d9-6260e8658fa2/traits_of_roger_in_thank_you_maam.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424275/65951807269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebc852e-248a-4703-8db5-f7dc1f9c1669/22001456360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d49e63-ba69-415a-9d3a-9914bfc54817/le_secret_du_coran_pour_devenir_riche.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144431574/mitosis_worksheet_matching_match_the_term_to_the_description_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3f8840-30d5-40f2-8bb9-431396ecce41/present_continuous_passe_recent_futur_proche_exercices.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144452880/asure_id_7_express_crack.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/tizute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084734d9-f744-4771-8ae1-eb2a9d5821ac/how_long_are_west_virginia_schools_closed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b604fe04-7f8c-4af5-9b13-481c57728d9b/how_to_get_rid_of_acne_scars_on_back_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8f10b8-c0c8-494c-a599-41e0a3eb966f/86998657263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bf53de-dc07-4bb7-8d55-e955bb0afd81/jetking_computer_hardware_and_networking_course_fees.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_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 5572 bytes
SHA-256: 76457152e7ac34226b9e06b8544d41c2799271b762a83bd054500e1de4cef8a1
font_01_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 10812 bytes
SHA-256: 6d7ea4bc2108f9398517886bc603d19ffbd31104d1a718ba4c7ef10cf1b96615