Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb83d7b0a7b2327…

MALICIOUS

PDF

72.4 KB Created: 2021-06-12 17:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3055b0416f5fc9f00a301526278b7618 SHA-1: 68f0b0f0310bbccd3ccb1a8d791c28095f546bc5 SHA-256: 7eb83d7b0a7b232704872edb5237987a8dbd5c0cc50d68b26f6adb3ebfa82c7c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'crewmak.ru', which is likely part of a phishing or malware distribution scheme. The document body, though partially corrupted, suggests a lure related to a 'secret calculator app'.

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://crewmak.ru/pbw?utm_term=secret+calculator+app+iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5ff6bfb47d784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_605b7d58bdcd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pajajafilexe.pbworks.com/w/file/fetch/144732066/ejercicios_de_estequiometria_resueltos.pdfIn PDF document text
    • http://gibudufu.pbworks.com/w/file/fetch/144597981/codes_for_philips_universal_remote_sru3003wm_17.pdfIn PDF document text
    • http://kunixove.pbworks.com/w/file/fetch/145195848/27832995972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a439afec-94cd-4d31-a1a8-c4e85bd0ac27/litaxajutowolun.pdfIn PDF document text
    • http://sawebaz.pbworks.com/f/connectify_me_full_version_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d614ee-f2b4-4b28-8e60-1eb07062d770/ray_bradbury_the_pedestrian.pdfIn PDF document text
    • http://zulamiz.pbworks.com/f/brzezinski_the_grand_chessboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3ae9a9-a0aa-4edd-90d8-7c561b1fcb65/how_do_you_add_apps_to_panasonic_viera_tv.pdfIn PDF document text
    • http://madatev.pbworks.com/w/file/fetch/145096566/nba_2k20_download_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82bf3ad-39c4-4f37-b3d4-0876d4c6bf44/2472299962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33722c0-808f-4395-96a1-d43da40e3b09/48919159858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7f1678-0e71-4098-b4b2-e57f1b2e060b/44662799668.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/f/42102534844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cdfbf1-90fb-4afb-a363-5d887125611c/64112951985.pdfIn PDF document text
    • http://denakubi.pbworks.com/w/file/fetch/145161828/chapters_vip_mod_apk.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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 4948 bytes
SHA-256: 433ac2e38d4add034546ca7cf57029613ce06ad3b0f99b39c8bee88a87a7044f
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 11124 bytes
SHA-256: 7f742ef1e7d5357e9eca1e76156703174bb728006a12c41ae804110c24f4e678

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