Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f0199fbbbdb458…

MALICIOUS

PDF

66.6 KB Created: 2021-02-10 02:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5cec9c215e8e7278d64bc9adad33c4a6 SHA-1: e677540bdb1e1740e6690c6568059a280cd9d87a SHA-256: 51f0199fbbbdb458541478cf95a129cf66a0a0aa45d7360f00495185a84031df
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs are common in phishing lures.

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://leonvi.ru/aws?utm_term=egyptian+cotton+sheets+buy PDF link annotation
    • https://cdn.sqhk.co/guwaloxipete/jaR7wgf/world_history_textbook_pearson_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/niminililez/Fhcjj7m/hobby_lobby_black_friday_ad_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/ehgie4p/navneet_nishan_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/vemoderama/egjC3gc/parkour_games_for_free_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_601ba91057e35.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/aAxdKG0/kakosezitunanipomafovofix.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/2124284.pdfIn PDF document text
    • http://voicebftyi.com/graph_theory_handwritten_notesv1nbj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6014e3a66d4a2.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/dc080416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6020d5520e4fd.pdfIn PDF document text
    • http://creditstar-kabinet.com/9033467508kb6r9.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/1506777.pdfIn PDF document text
    • http://agent-spv.space/rationale_zahlen_multiplizieren_und_dividieren_aufgabenhqjyr.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/mipeboro/hockey_stick_buying_guide_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/risultati_serie_a_2017_18.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/hpu_student_portal_datesheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/body_language_game.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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 5268 bytes
SHA-256: e2324e1be4b44c512d5897fecfe9f4dad5b4f2beb313ed0ea762a60b9ba557ee
font_01_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 10220 bytes
SHA-256: 005d3671b0951f7bc07dc49e795df851293e16c986afedc2c20d93021e71ef57

Open this report in the interactive analyzer, or submit your own file for analysis.