Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2d30fe4a8c798d…

MALICIOUS

PDF

124.3 KB Created: 2021-04-22 21:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 10e53170623e73386e9fbf39496cbfdc SHA-1: d941f4a12ed027e0d2482ab9850706fa6b575539 SHA-256: 8a2d30fe4a8c798d183660b612023bb57d21045811cb02adf4262db8e8b6d47f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple embedded URLs pointing to suspicious domains, with one heuristic specifically identifying it as a redirector link to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=watch+the+pact+jodi+picoult+movie In PDF document text
    • http://pinegrvuig.fun/the_culture_map_audiobook_freedfz68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_60144fe15de99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_60076003356f0.pdfIn PDF document text
    • http://contact-git.top/364841525783lf55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5fecb53c1f907.pdfIn PDF document text
    • http://erogan-encolumbia.site/supubulofiwifezimudawawivfulw6.pdfIn PDF document text
    • http://newsportstechnology.ru/los_juegos_del_hambre_en_llamas_pelisplusjjb9a.pdfIn PDF document text
    • http://smartcoin.design/vatomejuxomibododan00n5e.pdfIn PDF document text
    • http://uscarins.info/xijanezudolipanazamuzajrkfp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_6017032f455fd.pdfIn PDF document text
    • http://atomyimperial.ru/diablo_3_barbarian_gems_guidew6d46.pdfIn PDF document text
    • http://genoray.pro/25598226787wm3z5.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/how_to_score_ten_item_personality_inventory.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/benode_behari_mukherjee.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/tugumeb/which_english_accent_is_most_attractive.pdfIn PDF document text
    • http://mibesajaku.epizy.com/bushnell_trophy_cam_hd_wireless_2g_manual.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/cache_memory_types.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/99405883231.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/free_tax_invoice_template_new_zealand.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/wowodegaruwuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/new_language_leader_intermediate_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/bahubali_2_mp4_tamil.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_off0001a829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A829 5188 bytes
SHA-256: 39acec3672774d2d380626d026bd52a2fe7f6f1a8ab3f4e4264b6fb08ecc3ada
font_01_sfnt_off0001b9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9BF 11856 bytes
SHA-256: 4882d06c7c4394cc2797a2720583d177cfba146179fbc0325de0ad89ca30559f

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