Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bdc584d4e2035e…

MALICIOUS

PDF

84.9 KB Created: 2021-03-03 01:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 63c11d5f33c5ff4bb3d610159435a794 SHA-1: 7821db6d732857685d83df1f227c8d18dd88d741 SHA-256: 15bdc584d4e2035e7d629a16a9e6e77330123018367471b7f7c6f68d9bd5d521
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=how+to+replace+water+filter+on+samsung+rf28hmedbsr%252Faa In PDF document text
    • http://elerctum.org/memory_andrew_lloyd_webber_partiturarq415.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/pagasunif.pdfIn PDF document text
    • http://francobusiness.com/idolatry_in_the_biblexqu7d.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/0jh75ia/wwe_champions_2020_how_to_get_superstars.pdfIn PDF document text
    • http://podarokinsta.site/why_isnt_my_ue_boom_connectinggwl5c.pdfIn PDF document text
    • http://mscgis.net/biological_classification_mcq_for_neeta24s0.pdfIn PDF document text
    • http://fenellalucynelle.info/ejercicios_de_lexemas_y_morfemas_2_ev91si.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/pezuvix.pdfIn PDF document text
    • http://rafale.store/38788791103yhj2m.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxazagugura/gjEbghG/dasowerejifawutuvanafage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_60176a7ab6316.pdfIn PDF document text
    • http://berkeciftci.net/60088298697roq4y.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/c6e8554.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/heZNih5/banana_blast_game_dice.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepizevut.atwebpages.com/noxenegaduserudubutubos.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_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 6124 bytes
SHA-256: c092eb9cebc0aa04d27ea5dcdce50ff6ab397d97e148d69e58ec29899f49c05b
font_01_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 11204 bytes
SHA-256: a6c0498d950da68cb75b675240c6e9ce44eaf8864e2a4aa33cdee1b2ab5b7f1b

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