Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ac624a099f7bd3…

MALICIOUS

PDF

134.1 KB Created: 2021-03-20 22:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3805518c58f3a6090c1f65694baba562 SHA-1: 43a2bb2b8acf4fc40a4639bb929c33bcf932484a SHA-256: f0ac624a099f7bd31473a22355cf4f2d558305a0b0c88b4ea696f75bd14cea05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains multiple external URIs, with a primary suspicious URL being 'https://resalured.ru/strik?utm_term=hp+840+g1+launch+date'. The PDF is also flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect the user to malicious content, likely exploiting a PDF vulnerability.

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
  • 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://resalured.ru/strik?utm_term=hp+840+g1+launch+date PDF link annotation
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/bb931c2.pdfIn PDF document text
    • http://devlp.design/56034887491vqhug.pdfIn PDF document text
    • http://netewe8.xyz/browser_fps_games_nozhymc.pdfIn PDF document text
    • http://idealica-co.site/what_is_newtons_law_of_motiondzeyh.pdfIn PDF document text
    • https://kaxemesotom.weebly.com/uploads/1/3/4/7/134732336/ce260385.pdfIn PDF document text
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/dufiwego-lilepolu-ruvizudufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f6e7f2-ebe4-45b0-98c7-aa2a8d0bf2e2/romeo_and_juliet_storyline_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4c44f7-0df4-4809-a0dd-69e7d76ef0a1/medios_de_comunicacion_en_el_salvador_wikipedia.pdfIn PDF document text
    • http://kudelonibuwulaj.rf.gd/entrepreneurship_education_in_secondary_schools.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_73f826b4870841abb50ff95b2a575dce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa45654-01cf-4526-b0e4-4e55ff923e82/40535621965.pdfIn PDF document text
    • http://dijixalokeditix.epizy.com/how_many_books_are_in_the_left_behind_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810a9396-35c7-4956-9f35-5cd7765164f9/mamejijuperanibubuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55776c8e-f76e-4a1c-88c2-e0b7192dd8a8/dawamidalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e4aa54-12ae-4b98-81c8-080c3bd4cd9d/what_is_eight_limbs_of_yoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02e5bd9-4f17-4fc0-ae22-33300a16ef05/how_much_do_carrier_furnaces_cost.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_ee549e2e0cc745b2b4ca5faa6b3f2406.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_off0001c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C820 5496 bytes
SHA-256: 56da3932e7778b6d028948c350066c6b91d2b0904631ca5c296ef5629f20ceb8
font_01_sfnt_off0001dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DADD 15172 bytes
SHA-256: 3083439faedd207f12b3157de25e84aa35bdaa7fec62d24596dd526a839aade8

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