Malicious PDF — malware analysis report

Static analysis result for SHA-256 f788e13d79f71f8f…

MALICIOUS

PDF

87.7 KB Created: 2021-03-17 05:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbebd88d007d87b389fcb940b7dd2bf6 SHA-1: 88465949b579e50ad8daa30fbf5e00c08e4021fa SHA-256: f788e13d79f71f8fb3ec2f40ff492c7175848e1f032c35b139affecb4da14578
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a large number of embedded external links, suggesting a link farm or phishing attempt. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=metformin+hydrochloride+tablets+ip+500mg
    • http://kutakelipaxeb.22web.org/thermochemistry_and_complex_ions_lab_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_600f78d1ad58c.pdf
    • http://modebedunizux.iblogger.org/element_40_inch_smart_tv_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4468823/normal_6025b7650daae.pdf
    • http://kavalibosesevu.22web.org/vifibizirosowufiza.pdf
    • http://jegewuzewan.iblogger.org/50255193850.pdf
    • https://static.s123-cdn-static.com/uploads/4369174/normal_6007abd3608c6.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lanubili/89792392790.pdf
    • https://uploads.strikinglycdn.com/files/3689a09d-d387-4887-8d09-b1d610363602/nugusolonapezokaw.pdf
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_031df404c7714ebabf8c0fe61d70d2e3.pdf?index=true
    • https://s3.amazonaws.com/budovewesekaz/bawemeguzojexisu.pdf
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_0ab9e390eecf4f689a15e72e1fe896ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25f4c8de-e2ea-4ab9-87f2-b8fbf1e103c9/sepo_y_sapo_inseparables.pdf
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_471bbc5537554e128f274cce8afbbc28.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4724ddfc-f4bf-489a-9f25-bbf7fd3f095a/nordictrack_c2200_price.pdf
    • https://uploads.strikinglycdn.com/files/77024b78-fbc6-47b8-b10c-09249e57f8fd/montblanc_little_prince_ink.pdf
    • https://uploads.strikinglycdn.com/files/2401c738-f5a6-4543-86fc-55d863416149/xumixafujipet.pdf
    • https://uploads.strikinglycdn.com/files/c610f13e-5cd4-455f-b208-754a0a1c3db6/litufonukodutitigozekad.pdf
    • https://uploads.strikinglycdn.com/files/59209fec-69c1-4462-8c4b-1df2cb274898/what_order_should_i_watch_the_hobbit.pdf
    • https://uploads.strikinglycdn.com/files/81582c87-8d09-463b-9e54-b1860894acdb/95941397683.pdf
    • https://uploads.strikinglycdn.com/files/4f523958-6b6f-40ea-bd1a-2e8b22acadda/zirifaxiwoza.pdf
    • https://uploads.strikinglycdn.com/files/f6ecb0cb-d72d-49f5-a579-424be1133783/gojokotejamorusip.pdf
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_67c215e36e8647cbbbc1e64eaaded697.pdf?index=true
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_b0e6c7bd4935498e81ab01548c56d03f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cdb.bin
3480c55784b56b30103e7ce104023669119397bb16b4866b09a90a8ad0bb0338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 1560 bytes
font_01_sfnt_off000114d8.bin
34b38bcc8b6d6aa20c9c04bbd8d6cc3550f7f159d50a6f655f93d6b1cf70323c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 6080 bytes
font_02_sfnt_off00012973.bin
3c03aa81b25bf1a88b46eafda0b2ace7853a33070041765daaa7b39bc7e69f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 10836 bytes

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