Malicious PDF — malware analysis report

Static analysis result for SHA-256 2905ac41c72fd6fb…

MALICIOUS

PDF

71.8 KB Created: 2021-03-21 01:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0029db0ccd803ddc01125c15b0f519d1 SHA-1: 6311559aed07fde74c7182ba4cd4e013e79fce41 SHA-256: 2905ac41c72fd6fbcf73aaa97db465ba2f6186784a315172c3f1521926d6fe24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://shoop-fm.ru/reckless_rider_3d_hoverboard_smart_self-_balancing_wheel5up7l.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ffa3eb55dc7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_5fe9b5f90d945.pdfIn PDF document text
    • http://mkuu.club/vofeditevudivabejezitiju6towd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_602d75726da1e.pdfIn PDF document text
    • http://garderob-podolsk.ru/sufotaririxamomexazikamu666em.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fff3a245f6f5.pdfIn PDF document text
    • http://phillipen.online/dakowaxokowavobunugrrru0.pdfIn PDF document text
    • http://shop50off.info/49228404598zlgsd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5fd1e876585a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6054228aa0e96.pdfIn PDF document text
    • http://helplnstagramoffice.com/lg_model_lfx28968st_replacement_partseis3m.pdfIn PDF document text
    • http://fragcups.com/sample_project_management_closeout_reportqbmln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=milady%20cosmetology%20book%202016%20editionPDF link annotation
    • https://uploads.strikinglycdn.com/files/48e734a2-1b6f-40fc-8a33-1230659f5ad4/92712718100.pdfIn PDF document text
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_de8013ec3e1d4804b2b409fe1930a5c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d849727b-5db6-44f2-bd8a-60055dd2b13e/kopawut.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_00bfbb2c7dfe4454a9086c4e10fc9ae1.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_45b2b66561634b5bbfbfdb365b1e9d1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88d8386-2cf1-46d1-9f77-633a000eae1d/29549756141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac5bb84-4127-4709-a966-e023172c7195/572602202.pdfIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_86248d5745114aa9aaa186c2d27abe53.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_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 5956 bytes
SHA-256: 85d31d62e811fbf7400995d8c125b0f1c6f2c6c7ef027fa3634d6d8275e12e16
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10572 bytes
SHA-256: c1ffc9b016e97c3cb1d9b48e901533d8c47a42792501e0af3096cdc832c7381b

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