Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81e9654d5a7bb9f…

MALICIOUS

PDF

101.6 KB Created: 2021-03-04 00:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1ffa7789ac8e929d16064b45faba94e5 SHA-1: de1993657c0d8a355a8f1efc5425997c336df308 SHA-256: a81e9654d5a7bb9f97353a85b30bf0d6f54ecd95666c92c4efa4dc53e822c1ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=what+is+the+major+theme+of+the+crucible PDF link annotation
    • http://tesevamomavuruf.22web.org/age_of_wonders_planetfall_dvar_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_5fdaefeabd2cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486775/normal_602365a400d04.pdfIn PDF document text
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/sarupulob.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/cXIYjfO/ocean_survival_3_raft_escape.pdfIn PDF document text
    • https://wapawovukeped.weebly.com/uploads/1/3/5/3/135333371/rovomuwowaveda-modusimoralepa.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/9d3dda6ef288.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/4586535.pdfIn PDF document text
    • https://fadunununi.weebly.com/uploads/1/3/4/7/134747036/xozavoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fc68a5f93d36.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/pasutiz/full_hd_movie_evil_dead.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/upsc_exam_full_form.pdfIn PDF document text
    • http://supedir.epizy.com/fuwogalupu.pdfIn PDF document text
    • http://renubinivudeti.epizy.com/bangla_new_song_audio_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/atkins_fisicoquimica_8_edicion.pdfIn PDF document text
    • http://rexawisoza.epizy.com/auxilio_judicial_temario_gratis.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/tazabodavenirakema.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_off000152fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 5352 bytes
SHA-256: 6a7538f91aea718865fcd19139af9eee7556610ca9ad4ba35c98d8ff0f8db23f
font_01_sfnt_off00016512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16512 10700 bytes
SHA-256: 10367fb8fafc48bb362fed4b860181247394d869031ce11de8456305ebdd6f60

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