Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea72b727ff5f9bb0…

MALICIOUS

PDF

80.1 KB Created: 2021-03-28 10:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: bc1fefc3a6b9df91b1b43f7bcc9f9d23 SHA-1: 56796c7f94c43c3a52da674b0e43616b3dbcf46b SHA-256: ea72b727ff5f9bb0020fec65a74a1db4ae6c19ea00ae6a428f2f7fa8562ad544
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/award?keyword=iec+ballot+paper+2020+pdf PDF link annotation
    • http://gafujovinotu.22web.org/powufamerozajonugupubu.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/ibxZdie/joxixaje.pdfIn PDF document text
    • https://futuratolofuzup.weebly.com/uploads/1/3/5/3/135399438/b74ab2261637a8.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/h8h5aij/spanishdict_translator_app.pdfIn PDF document text
    • http://wedogadev.iblogger.org/37015170074.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hjojbgL/mesinitedufijefizivadetu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/fjbqidd/18207305961.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/MUZiigh/high_school_escape_level_2_walkthrough.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/relel.pdfIn PDF document text
    • http://tefulen.iblogger.org/pivabigofezomefuru.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/2igiahj/jogitebewelunarawamefa.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/ygegfZr/bluetooth_car_diagnostic_scanner_amazon.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/wuwuzefepu_nubume.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/Ihf6hb4/niduzota.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/1907ec43.pdfIn PDF document text
    • http://kigenavozos.iblogger.org/hamilton_beach_air_fry_sure-crisp_toaster_oven_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tinezedu/what_are_all_the_harry_potter_movies_in_order.pdfIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_72eab58e61814b2f82f7f59602a2a903.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_6a215d50e7b1424daf4e9b915da46db4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/27006517919.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/foxetesonobemosewi.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_bda8bc7133f8455c9e55b92177e1d0ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/ribenelized.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_85ba2410b18345aa9b81448f0fac674a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 4956 bytes
SHA-256: 9d00c47f97f4969efa15074cef00ef889f31c6310413d6b400b13ce80437b0f6
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 11160 bytes
SHA-256: 7f81c415b7137ffe74b56ae2436d8cde7d6efb871f7d9e2f497f27e1b957404b
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c