Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e137528e3496c9b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-01 20:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0c8663fdd95c12142e9cb7c3a7ff5de2 SHA-1: 3b43ab2891d7d3a370efc90a38e71e7dff6b71b8 SHA-256: 4e137528e3496c9b8897265e316ea9e0ee22247337bdece81678bb33de88d653
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to reference software system requirements, a common lure for phishing attacks. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious 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://huntic.ru/pbw?utm_term=premiere+cc+2019+system+requirements PDF link annotation
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/6751335.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/1d0aff85c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_606b422319c58.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/sametetiwuwonoxom.pdfIn PDF document text
    • https://gasupajo.weebly.com/uploads/1/3/4/6/134624661/f4eeb0d.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/vadiruxifigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_604ab1a22dc27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_606c45ddc0fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_605e1669ef8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_603c2e6485341.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144458667/85302436427.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144411768/mowivar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e134d6-b592-4252-b14d-b0e5c139343a/how_to_use_sodastream_fizzi_one_touch.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/resimli_engel_bulmaca_oyna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4b26f1-5c38-43e0-9689-00c1d7362601/24884363834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ceddeba-3a16-411b-9ed1-367774a46a5b/xikupodafijadofobetelamal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b496bc1-ba2d-4ef5-88c9-0a9cbc43d491/wimudobisewunalanuzedatix.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/57720458720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faeb56be-ef55-4836-8266-5e38710f9b2a/12_times_tables_worksheet.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/quadratic_equation_multiple_choice_questions_and_answers.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_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 5416 bytes
SHA-256: 91d6a51d92eef3b85ba62d946eca3dcd571cf0f8c48266f7c3b90d0766ab5cf5
font_01_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 11828 bytes
SHA-256: 689340d07cd50ff3f8b7a4b4e5526f513e4a405f323169559b310f39ec05e1bf

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