Malicious PDF — malware analysis report

Static analysis result for SHA-256 b291b212d7e91434…

MALICIOUS

PDF

76.6 KB Created: 2021-05-15 00:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d4480e6cdb9f52514026bed7d9e6aa0 SHA-1: 6f0b893c7a59e5f4dcb1343b6e7b43e2b8debd09 SHA-256: b291b212d7e91434649d0b17ad5a6228a37a093995b410c3ab24278fb1c190f8
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the malformed stream length heuristic and the presence of external URIs suggest the PDF may contain embedded exploit code or JavaScript designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jacksth.ru/strik?utm_term=what+is+a+reverse+isekai PDF link annotation
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/6244135.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/2847381.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/obc_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd0a8334fa1e.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/1621480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_6046864d8fa3b.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/kittel_solid_state_physics_solutions_chapter_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_60502714ddeb6.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/2038426.pdfIn PDF document text
    • http://vclean-sale.shop/lord_shiva_hd_images_free4psqh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386836/normal_60099862c85fc.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/112675.pdfIn PDF document text
    • https://xoxulesajoxe.weebly.com/uploads/1/3/1/4/131438427/2648126.pdfIn PDF document text
    • http://rodina38.ru/mimezyrpdq.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/5857625.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/citta_bula.pdfIn PDF document text
    • http://ccckkkkk.space/boss_engira_baskaran_meme_templatekhtrp.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/3454310.pdfIn PDF document text
    • https://nesexije.weebly.com/uploads/1/3/1/6/131607346/1330179.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/nigimul/41187586810.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/android_10_update_issues_pixel.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/video_tren_facebook_ve_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/what_does_master_warning_light_mean_on_kia_sorento.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/antique_olive_bq_font_free.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 4880 bytes
SHA-256: c15c2e71dcd260b57a5a1e7764b98cb0c2a5f87682c5972eed71ae44d3d506e0
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 11632 bytes
SHA-256: 900922e805ded67a31a67b46ece8843c89354e8d5bba243ad21f2e7a44ec4da5

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