Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd47becf391870…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 21:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: efe056717a9e7cbd9407272ae0d4cfcf SHA-1: c32fa979cf5c8743966eac8c5ecec1d6547fdf83 SHA-256: b3bd47becf391870d3fc93f3ce808b975446dedcda9afbfbdbe301c3c3f48ced
186 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. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though partially corrupted, contains a title that appears to be a lure for users to click on these links. No scripts were extracted, but the presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+a+man+treats+a+woman+when+she%2527s+pregnant PDF link annotation
    • https://cdn.sqhk.co/tinolaseja/fre4jhD/86335051063.pdfIn PDF document text
    • http://popularchoice.space/actividades_para_3_de_preescolarcxl8j.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/EOjjmic/mlb_playoffs_schedule_network.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481990/normal_5ff08d3d8491a.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/jaalTXG/fikom.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/gfhjYLR/simple_weekly_lesson_plan_template_word.pdfIn PDF document text
    • http://tradebot.space/4715709518716ote.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/jjiajgk/38973406786.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/djbXvS2/warrior_cats_toy_videos.pdfIn PDF document text
    • http://parkji5x.xyz/what_does_the_end_of_war_of_the_worlds_meanq22wj.pdfIn PDF document text
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/3462681.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/8728506.pdfIn PDF document text
    • http://mishgen.com/revista_boticario_ciclo_4_2019gmdkp.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/ggiha98/78243859861.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/i4zgjji/walikunitek.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/nabifovu/kinemaster_premium_cracked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/wekid.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/csr_report_of_indian_oil_corporation.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/accounting_terms_word_search_answers.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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 5288 bytes
SHA-256: 36e18cf5c4ef04540d19fab32ae3a35f8529e15eb8e1ff0bb2b135ec80cf5e43
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 11008 bytes
SHA-256: 41897b0c01b9aa9fdd14f9ddfe73880b75c16efd7ecd9f1f9d7e38f7ae5a0bcb

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