Malicious PDF — malware analysis report

Static analysis result for SHA-256 82948c85b4b2fb9d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-06 22:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 11f4641744f94b841725fdb1f61bd7ad SHA-1: d35b8b74222db65ded1c775e490bcbc63d3f015e SHA-256: 82948c85b4b2fb9d13ff4510a827aac0fa6377c6702f959c4409ca1d0e1a6d68
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to search terms, suggesting a lure for users searching for specific information. The presence of multiple disposable domains and redirectors points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=is+microsoft+project+available+for+mac In PDF document text
    • http://fijexojor.getenjoyment.net/12874193510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410717/normal_6004da61037a6.pdfIn PDF document text
    • http://wide-mean.top/nogelaxabuletarixovwsmsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601a99ce468d0.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/can_you_bypass_lid_lock_on_whirlpool_washer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_601f014c474a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367927/normal_5fe5ff3d3181d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fe670f120abb.pdfIn PDF document text
    • http://strahuemsya.info/potajumagigizoqo72j.pdfIn PDF document text
    • http://kipeliri.22web.org/51274569018.pdfIn PDF document text
    • http://sbrf.link/5_month_old_milestones_what_to_expectm73en.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600b636c036dd.pdfIn PDF document text
    • http://afracheat1.xyz/prokaryote_coloring_worksheeteo6gb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383579/normal_60039aa5ad043.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/why_is_a_california_roll_called_that.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_600b6296ca893.pdfIn PDF document text
    • http://policyhelpcenter.com/whats_the_difference_between_the_great_awakening_and_enlightenmentm0e1r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5ffc39e74d61c.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/21618649121.pdfIn PDF document text
    • http://yourbigdick.space/evaluation_ce1_1er_trimestrebpydx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubadix.epizy.com/29131598600.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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5372 bytes
SHA-256: 90c814c4dddd7f63820a3fe5071bf189fa03ff879d878dda9d23dee820da580b
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10560 bytes
SHA-256: 11d3783e597268f4afc4ace06d5fea445d2272c8012a9a2567775a1561390468

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