Malicious PDF — malware analysis report

Static analysis result for SHA-256 df43955ae5c8ec1b…

MALICIOUS

PDF

70.7 KB Created: 2021-01-25 03:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 99995f5b6a826b3e679ed8cc576ea99b SHA-1: b69ff09ab773c10644e6828c516e0e75442fab03 SHA-256: df43955ae5c8ec1b9c8ff091a5a38d36801a3797ef858003f5355c1668372fdb
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'honradez y honestidad' which aligns with the malicious URL's UTM parameter. The presence of numerous links and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=honradez+y+honestidad In PDF document text
    • http://fruitslope.online/war_of_the_worlds_1953_blu_ray_amazonf96oe.pdfIn PDF document text
    • http://fofafik.iblogger.org/al_quran_dengan_terjemahan.pdfIn PDF document text
    • http://arm-watch1.club/92992561284etstv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5fff0d8be6e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fd7d09032a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6548668efd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_60007e5c6506e.pdfIn PDF document text
    • http://poradoit1.site/cabins_ocoee_river_tennesseerozqb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5ffa2aaf9f4b1.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/vebisop/37659827550.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/basler_racer_gige_user_s_manual.pdfIn PDF document text
    • http://worurekebisur.rf.gd/artificial_intelligence_books.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/gemolamepidituzexaz.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/liromugurasawesogijudadiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/filtre_aspirateur_electrolux_cyclonic_ultra_performer.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_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 4992 bytes
SHA-256: fa2045412f9c231fcd167547cc0028330028104ba7bb453ff9c7f6e68ae4b086
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 11364 bytes
SHA-256: 5344e901d04211fdf2b01ee19386c86af2124ed8dcd6b9584c19842a6414be59

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