Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d9df7ea94cd557…

MALICIOUS

PDF

82.1 KB Created: 2021-03-24 04:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13dd27f1ed9ca2d58e6e180f5f46ebe6 SHA-1: e79f3a0b007a08a15d2a91c51845073d3d54e876 SHA-256: f6d9df7ea94cd5570f9a183b4171218654822f8262ebb822c7f264e3eb2f94ab
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'druttle.ru', which is likely part of the malicious infrastructure. No scripts were extracted, but the PDF structure and link farm characteristics strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://druttle.ru/aws?utm_term=cuantos+metros+son+un+decimetro
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/7369256.pdf
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/7530901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pazatuv/cleartrip_apps_free.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_50bb397e62194452983da54c5e91e128.pdf?index=true
    • http://tuvufuxo.epizy.com/zotadokir.pdf
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_76e44f6f8e994e96b5f3a8ae98539d6e.pdf?index=true
    • http://gatituz.rf.gd/kogewozixe.pdf
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_c5e8b7e6548f4960836a0dcd155b7d20.pdf?index=true
    • https://s3.amazonaws.com/midaguvimabof/barisal_district_map.pdf
    • http://golofupatawef.epizy.com/certificat_cession_voiture.pdf
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_4fde3a1da0194747a7e0b61650f3d0d7.pdf?index=true
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_aed0db43eb0e4aa18a0353599462ec78.pdf?index=true
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_9b9c087a786c4009ae43c07d055f3d64.pdf?index=true
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_f477bce3e3cd41b9b7b4c0d5bffd8633.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_d020d0b9261c44b894ad9ed7762f351b.pdf?index=true
    • https://s3.amazonaws.com/xetasif/kopunefuzabaver.pdf
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_2a99bb256ed1469ebff0841ae414490e.pdf?index=true
    • https://s3.amazonaws.com/dinilederu/48831020200.pdf
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_637658c7060f4eb49f5cd5c06a7ce4a3.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2f.bin
2233bc345aa8a16c00d3d86f37fa8a1360498c16b56be4738c0fd3c0e9e00232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 4956 bytes
font_01_sfnt_off0000fdee.bin
d9fd38f5aba55476dba6584708e086571e4545012410b6a5b6e8f8fcb25d961d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 11572 bytes
font_02_sfnt_off00012435.bin
dfdc6983d3c42b81f9741fa6cdceaab3e97c1fbda00e6274acf933e6ff911e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 16100 bytes

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