Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcef40aba9556cd6…

MALICIOUS

PDF

82.4 KB Created: 2021-03-16 08:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d961c138ed0d2130a79030872c072f95 SHA-1: 81b105eefaaf814edb34fa3a5022a9d29307586c SHA-256: bcef40aba9556cd612ed60ac26ffa450e8799e77f18b034371b6466ba5d20439
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 hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to medical search terms, aiming to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=schizoaffective+disorder+bipolar+type+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5fda193161bee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_60035ff6390b4.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/nuredumaxusenuj.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/98492058079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_603b32ca26c73.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/architects_data_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_601304e90e038.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/eNNn6jd/lujokafewowafuxatikejelu.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/aircraft_engine_design_second_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/menumuxod/hfohhia/bayes_information_criterion_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_602f4c2a87c0c.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/2d63b549-e95e-4540-9a62-7e92f6ec91e7/46261831385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf00fc8f-2f40-4ffb-b31f-7606a83d2f0a/80508860358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db14d30-465c-4b9e-baf5-79d25abd4fa9/3486049375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdf7755-7f86-43a2-90b6-c1087009fb93/american_history_books_written_before_1900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00addd4c-626d-47e9-a69a-2f3333b5f449/how_to_write_an_adoption_story.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/30308507241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddeb387-8976-48e8-88d2-21e1dcd818f8/73686086084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee777cf4-aeb7-48ca-a844-7f694cd8065a/timex_expedition_field_chronograph_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3387a3-cf4f-46d8-99b0-27eb2552b636/how_to_reverse_a_sewing_machine.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_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 5696 bytes
SHA-256: e9239336549293514e7b2fd60f6bf53391f82472de77a68fb699db457c49318b
font_01_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 11624 bytes
SHA-256: bf92aa1338611ae7b835178e172385370318c0fbec9e84a512e939e29cae7964

Open this report in the interactive analyzer, or submit your own file for analysis.