Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a5dafe0b1468ab…

MALICIOUS

PDF

78.9 KB Created: 2021-02-27 00:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6192bc681c630d6a700e16812b059302 SHA-1: f8701d0f78fd7bb92a5e280fc3b6c46011db4ba8 SHA-256: 88a5dafe0b1468ab3ca1a4f605acb78d8097ccbb2b4a7ea94b1b3b5c64336c34
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its use of multiple heuristics indicating it is a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to PDF editing and wkhtmltopdf, suggesting a lure to disguise the malicious intent. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or scam 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
  • 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://gimoguvi.ru/award?keyword=how+to+write+on+a+pdf+file+for+free PDF link annotation
    • http://biomanua.website/3928619153550uol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd298d017d85.pdfIn PDF document text
    • http://shopwithsale.website/how_to_draw_a_realistic_girl_face_for_beginnersciv9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_601571acd8710.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/e2213652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5fe30483dbada.pdfIn PDF document text
    • http://msertis.xyz/how_to_fix_a_honda_lawn_mower_pull_cord5wwpv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5ffb2bba5283e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_5ffb7958374b8.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/sivejaxapudapelifedes.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/what_is_the_best_process_improvement_methodology.pdfIn PDF document text
    • http://easylearning.space/vrchat_windows_mixed_realityr9cld.pdfIn PDF document text
    • http://nakozek.mypressonline.com/dokulufipe.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/muxozesepibike.pdfIn PDF document text
    • http://lifeit.pro/conditional_formatting_in_excel_2007id06i.pdfIn PDF document text
    • https://somizinizerolu.weebly.com/uploads/1/3/0/8/130873918/2323972.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
    • 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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 4696 bytes
SHA-256: 838afb354166d6e8bd0bbb8701a1f07bfe275b8ce422097a7b026f5f24e85aee
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10688 bytes
SHA-256: 7554ebf650bf20c5770345b95834f306aa6a0039185beef3185a7a10a39185af
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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