Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcd5402b9c3ebd1…

MALICIOUS

PDF

86.8 KB Created: 2021-03-19 03:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ce7a787632b74a351c618f3baa153d76 SHA-1: 520ad323093cb494bb68be6f07bca6166203dd6d SHA-256: 1bcd5402b9c3ebd1d95db648fac9894bec832559a32c106d7826cc8fb8582944
126 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it is a link farm on disposable hosting, with a primary external URI pointing to 'nipisod.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the structure and external URL indicate a social engineering attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/award?keyword=brian+may+red+special+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414334/normal_60166bf1ed6ff.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/luvejisamexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_600b69987faa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fec50433c396.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/zikukeronogabagoxofiledum.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/nerazixoxazisumefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_60279b3b980a3.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/tokatefozude/causes_of_anorexia_nervosa.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_4f8dee6ad7e747a980b2e26f7326c5e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/why_is_iskcon_against_advaita_vedanta.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_9187f955cf804413abef83e08ce111fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12f5a9c-3b2e-4ad8-b957-89fd5a6bfb40/garmin_570lmt-d_dezl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd1adaa-8648-4396-912a-c50fec76ab97/nixon_the_unit_ss_change_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a127e06-12d7-4b3e-863c-87d35d06833f/funeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d9b9ad-52af-40e8-80bb-29bb227b1e4b/rfu_dc_out_para_que_sirve.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_96f73fb3544a4b6f8d8a0ccaf20ccb2c.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_943b811e242641aa94eb99ed9406cea8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/30121445590.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_b82ef23cc722466f95e9154d9181f36a.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_6e246df71e6f42909ce97532f6899cb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41095a5f-4d42-48f5-902a-3826f1ae1fe7/how_to_apply_gentle_leader_collar.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_7b3349eef71b40469250553f7d638c2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/fifty_shades_of_grey_full_movie_hindi_dubbed_download_filmyzilla.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_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 5656 bytes
SHA-256: 744d7be54c49441e34df5bb2d493b0873300bf3391088ca5688ee132ef9910c2
font_01_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 11240 bytes
SHA-256: 800bd63def856d1413371abf4b600ffe7bd9c9f0673d5e97ba4f8b0e390a5fc4