Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf874c610dbf1da…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 06:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b049c7def3cca9505c28026e0f042e01 SHA-1: 69981dc2f27a00ae62f45a2e5ef110d8627f16ce SHA-256: acf874c610dbf1dab31313711bde79aacb7bf180c6d9c8d6c2d9acab15d294c2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'British and American English words list pdf'. The primary attack vector appears to be directing users to external URLs, likely for phishing or malware distribution.

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://bologen.ru/award?keyword=british+and+american+english+words+list+pdf PDF link annotation
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/mefelinipezogibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_60464ca994cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_60158cc26b66b.pdfIn PDF document text
    • https://gekesixufomipi.weebly.com/uploads/1/3/4/3/134318537/4295714.pdfIn PDF document text
    • http://sosazeb.22web.org/kindle_fire_hd_7_charger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_603e313175801.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/6d71265d13902f2.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/dc116755a6c.pdfIn PDF document text
    • http://xosijitede.22web.org/39546421651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fcd33f905f49.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/3416621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_6017dce4b3b55.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://uploads.strikinglycdn.com/files/ee6038e8-ac13-48dd-a7eb-1c5dc66e6ca2/suvunujifurulavazedovetu.pdfIn PDF document text
    • http://bopasewawimugu.epizy.com/68504915584.pdfIn PDF document text
    • http://filubukuwewe.epizy.com/bqs_blister_packaging_machine.pdfIn PDF document text
    • http://mufogedone.epizy.com/51823104257.pdfIn PDF document text
    • http://lekanun.epizy.com/angina_pectoris_2020.pdfIn PDF document text
    • http://monulaw.epizy.com/23885859166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d04a2cc-4d8b-4497-b080-1708a06fe31e/19861508611.pdfIn PDF document text
    • http://rojapaj.epizy.com/37781906568.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 5500 bytes
SHA-256: 36ee82be9f85149432aa2ce4744556c842b38899cdb1fabca410d1256c195adf
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 11120 bytes
SHA-256: c992870c35f2f488fe86a788a0d667d71f09a441005110a02d755e913b107c50
font_02_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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