Malicious PDF — malware analysis report

Static analysis result for SHA-256 18af85ff2d92990a…

MALICIOUS

PDF

73.5 KB Created: 2021-02-15 15:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a642455dc8bf166174c5d3405b6f7281 SHA-1: b1da84f3467256ce10967601ced26f498edb9caa SHA-256: 18af85ff2d92990ab648df45f080305abe990259e85d8e8215a7ae4735b2d6b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and embedded URLs suggest a lure to external websites, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics further supports this attack pattern.

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://maypoin.ru/wix?keyword=unidad+2+leccion+1+gramatica+c+answers PDF link annotation
    • http://tarizuxewibob.22web.org/circle_template_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450511/normal_60154726c5a43.pdfIn PDF document text
    • http://grafoanaliz.ru/printable_coloring_sheets_for_3rd_graders1kbka.pdfIn PDF document text
    • http://fruit-citrus.space/28811135364syd87.pdfIn PDF document text
    • http://tryadasert.online/47564650921b9uh0.pdfIn PDF document text
    • http://kexazejarufag.iblogger.org/garmin_basecamp_windows_8._1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fec7084350a4.pdfIn PDF document text
    • http://mekuwomusaxonod.22web.org/mifutegojelafone.pdfIn PDF document text
    • http://bivasezi.iblogger.org/que_es_carcinoma_basocelular_morfeiforme.pdfIn PDF document text
    • http://weinmvc.net/notebook_malayalam_movie_trailersl21w.pdfIn PDF document text
    • http://judijemavup.22web.org/m._a_english_date_sheet_2019_bzu.pdfIn PDF document text
    • http://alifan.store/solicitud_printaform9xur7.pdfIn PDF document text
    • http://eduha.online/camped_rini_piano_sheet_musiclvk5y.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://s3.amazonaws.com/jarirotexab/cabergolina_posologia.pdfIn PDF document text
    • http://jidojig.epizy.com/aha_ischemic_stroke_guidelines.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/lagu_chief_keef_i_don_t_like.pdfIn PDF document text
    • http://dulaxidej.epizy.com/76557966221.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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 5312 bytes
SHA-256: 6c06ddb86f370e7168b11c00bd42bb3258f433c8ad71065438329aeea5e8ad06
font_01_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 10504 bytes
SHA-256: 2df0dc7b9fd3033affd8622d75f1f0b48eb7776c7b0a90d1c219fd5abfa87a58
font_02_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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