Malicious PDF — malware analysis report

Static analysis result for SHA-256 998001cb8cbc255f…

MALICIOUS

PDF

84.8 KB Created: 2021-04-04 17:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aec1a229cdc4f7a78bba289104d2e851 SHA-1: 6a2883b948fbc16187801675bbdcdb6e1cb21678 SHA-256: 998001cb8cbc255fddfe99751b9931ac3ad2ba240a910df03c56631781c5c314
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as potentially malicious link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://jumiwimov.ru/award?keyword=assembler+deux+pdf+en+1 PDF link annotation
    • http://fulukegoror.getenjoyment.net/septoplastia_e_turbinectomia.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/sujet_brevet_svt_2020.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/phonemes_and_graphemes.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/gugaxezebinana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_5fd2770970d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6033a56a47eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_6069932fbaf2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_6064e522436c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450427/normal_60066825c4974.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/tazopaju/85904759088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef50b83-e664-458e-be34-ed46cb72adbe/no_game_no_life_ending_explained.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_1bac6d6c38f9408aa6183a214333a739.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/schwinn_sidewinder_bike_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/10038993452.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/58439857206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf63364-a0f7-4ced-a93b-3f910e5eaba6/fifty_shades_of_grey_movie_download_480p_filmywap_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474c22e8-f8d0-4369-bd2e-614d680f7cb8/surah_yasin_full_text_in_arabic.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_18c82637ecf6445c82e0c5621068adcd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/kizosoluteme.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_a607a50db55b45e9ba572f719fb565db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0bc156-6557-40ca-be29-ce49b92afca7/mepokugezapinegatoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a7c809-7811-4dee-b917-911446c81e53/how_to_unlock_a_whirlpool_stove_top.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_5c01a6e460e14aa095f2abefcdcfa3f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/mugimifeditefavagakox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99fe2c7-d084-4926-8464-f8324cf544e3/7_principles_of_effective_instruction.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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 5228 bytes
SHA-256: 3484a851724a278eceba4239974bd9b79f209824eebac0f0cbb8bc3d87b6de8d
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 10892 bytes
SHA-256: 7728f353c2c66b36029a3381c92151e704f1610b53c5d4c64c39f3184ee921c9
font_02_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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