Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23aec3499854c37…

MALICIOUS

PDF

73.1 KB Created: 2021-03-23 01:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0fe6a9a5c461fcc3ba231fb995808278 SHA-1: c42b1135454b18677a27873b55e30b9027968f9c SHA-256: b23aec3499854c37dc949a36c6e41ba7e3ac9ec5f6699e8a538e063558801bff
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as potentially malicious or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=the+witcher+3+bestiary+pdf PDF link annotation
    • http://gejejasofubi.mywebcommunity.org/bhagavad_gita_english_iskcon.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/researchgate_download.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/binomial_theorem_objective_questions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391602/normal_5ff97db43feae.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/86940983728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_60146c8c6ee55.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/77710884260.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/68191356068.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/stock_market_lessons_for_beginners.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/vedurewamigojefewufafel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vozerawirup.epizy.com/lakevevaroni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aef05ca-6a1e-4abf-849b-f86cab5d0352/immigrant_life_us_history_shorts_2_answer_key.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/mouse_party_psychology_answers.pdfIn PDF document text
    • http://xotomupifejiref.epizy.com/tipos_de_esquemas_elctricos.pdfIn PDF document text
    • http://gunubepixel.epizy.com/fallout_new_vegas_console_commands_skill_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9fe587-887d-4ec9-9c84-31e33dfdbff3/how_to_lose_weight_with_p90x.pdfIn PDF document text
    • http://jelunegizubu.atwebpages.com/cakewalk_ua_25ex_manual.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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 5660 bytes
SHA-256: 7c6e6f8970eac5c196403201c4860098a9dad05688ccf318666ccc6f404cf562
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10452 bytes
SHA-256: d81cb3eff86f21e13877b2763c084e3d7f201f97b9ed18753f294019a4d031dc

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