Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5450641e925eab0…

MALICIOUS

PDF

114.5 KB Created: 2021-06-15 12:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dd310bfe4487832e65f71d6d5f95464b SHA-1: e0c1b9f42f7cd2d8f06e86bc703a45c7f2ae160a SHA-256: b5450641e925eab04a84d4449280d47c28d2c4dbbd0066ec7a8675a1ab3070d3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with several pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/pbw?utm_term=invertible+matrix+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369901/normal_603e0838e64e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_60c3d83dc68ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fcb5a2cbd833.pdfIn PDF document text
    • https://xuzekivaf.weebly.com/uploads/1/3/1/4/131453918/wafixuvotuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389792/normal_5fdfc7a20c966.pdfIn PDF document text
    • https://deluneruniji.weebly.com/uploads/1/3/4/0/134012649/rabanisobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_605f4eb2380f8.pdfIn PDF document text
    • https://dibosowosobon.weebly.com/uploads/1/3/7/5/137511826/gokitib.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/de973d11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_60038f3346926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_60006819e661d.pdfIn PDF document text
    • https://wusunipusu.weebly.com/uploads/1/3/4/3/134320006/bapusof_bakagapopoz_majilobab_fewixali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_5fcbc0df96790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_60475fbe6e5f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijipusap.pbworks.com/w/file/fetch/145259019/ielts_graph_vocabulary.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/vafuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ec36b5-5729-4e4e-b2a3-eea6bc9a218b/48280088468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fb5ec7-81ef-4529-996f-88c16112b449/sub_zero_650_ice_maker_troubleshooting.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/delonghi_magnifica_s_smart_cappuccino_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bab556-7371-492d-9004-5517427739c0/ruxatevew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95adde8b-019b-4cda-9c12-8755b419d4ea/social_psychology_concepts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060313d2-86b7-4c16-b3b0-675798990ecd/on_the_origin_of_species_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1110210f-8609-4373-abc4-fc81a9d4239c/lycoming_engine_overhaul_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5920d9-9a7e-4f4a-8a5d-ea2a431e4454/jotogugezegegolanareb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b7a93f-ec01-4176-a6cb-f5bc52942bbe/where_she_went_book_series.pdfIn PDF document text
    • http://tazusun.pbworks.com/f/does_navy_federal_offer_free_notary_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d81744d-397a-4052-860a-8cac50f81da2/what_does_black_blood_at_the_end_of_your_period_mean.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000167ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EF 5032 bytes
SHA-256: 0c1a417deb00c6d885b4626007d8acab7adcedd89e40a5de34940964fc24b6f7
font_01_sfnt_off00017904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17904 13312 bytes
SHA-256: f946be32a1c52f8c6a9232c7b36940ec4a285fd316a640198fade576b8e3416b
font_02_sfnt_off0001a674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A674 16364 bytes
SHA-256: 90269f06d674f720f0ebe75e8ff96261ec71a7fedf2514d8d423507df0ab110e