Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91e5571d7ab7d0e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-28 09:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6168c6cea0fa5a5d6502a7702b9a0d3d SHA-1: 8676acd69435da93dd5bf33215064417d977a5d8 SHA-256: e91e5571d7ab7d0e6deac7dc5598c1ffca0fe03657974efb5e19f0ece0bef855
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=pca+notes+on+aci+318-11+free+download PDF link annotation
    • https://cdn.sqhk.co/pobojatizopa/hdl9jd9/24455152740.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/Nicieie/amazon_prime_video_app_for_smart_tv_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/bi2hdLc/17436446174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6019c5fbdbd6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527042/normal_5fdd43534e297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_6041d4ea89282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5ff219b22deec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_60557fe68918b.pdfIn PDF document text
    • https://cdn.sqhk.co/zisiribamen/1gjEJEq/14201133382.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/iae4haG/robots_coop_apk_mod_menu.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/sexoda_bixoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_60508db4d6575.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/vagefafek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_602f5052eff06.pdfIn PDF document text
    • http://tiurll.com/1m2vw3In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/gabuzozowanep.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/xubiduduweximanikoruzis.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_e9f926ac54804135a51aabb702df419a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posufij/3_month_calendar_on_one_page_template.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_b599d537100843a693aba3a40c3b2343.pdf?index=trueIn 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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 5552 bytes
SHA-256: 4b07ad47106936da2521d9a6d8ea0637acf7a1be0ff778ebe7a0e2cbf5cfe7ce
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 11804 bytes
SHA-256: 007dddb4e0c08ac53b89c84a8943fd27328e1da610594ea709e90d4397c3948e

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