Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1de7dcbcd6655f8…

MALICIOUS

PDF

73.2 KB Created: 2021-03-20 14:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8aadbd58d7795d4b780419f3d937a5f SHA-1: d6fa1bd6612994411935a84c96ceac4fc288366d SHA-256: b1de7dcbcd6655f89d7dbc93a6d9afdc240eb5916e52091851db53054549b24f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to exploit kits. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=skf+double+row+cylindrical+roller+bearing+catalogue+pdf
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5ff311d0dfd2d.pdf
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5ffc116f57744.pdf
    • http://zufutefej.22web.org/casio_g_shock_ga_100cf.pdf
    • https://static.s123-cdn-static.com/uploads/4456143/normal_5feb031cd4f2a.pdf
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5ff503c444198.pdf
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fd0641634a39.pdf
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ffbaeaf4f560.pdf
    • https://cdn-cms.f-static.net/uploads/4481285/normal_6041f8835c8e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_4a8b8544334146fd94c3212f83eb4236.pdf?index=true
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_70cd553e702e465881d5f309665c4065.pdf?index=true
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_497c1f02e9b74c959753133c61ab3fd4.pdf?index=true
    • https://s3.amazonaws.com/juzewojavomofew/memifiwelusolisalanapipe.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_c7c69094d2684236a71ce7d21bf51a33.pdf?index=true
    • https://s3.amazonaws.com/figidireki/east_iceland_tourist_guide.pdf
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_437ab4ef1fff40d199c1e40b6d1728eb.pdf?index=true
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_dd21a8c65c894120b09dfaa061051938.pdf?index=true
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_2c8eac96f2614ccfaba16a25cdcc5c32.pdf?index=true
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_3ea9ccf74ff047229a2819a0f312544f.pdf?index=true
    • http://tixesujimi.epizy.com/how_to_release_an_outline_agreement_in_sap.pdf
    • http://kerowet.epizy.com/vovubalasabutejib.pdf
    • http://xetafenup.rf.gd/neresezironopime.pdf
    • 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_off0000d4c1.bin
1ff2ced2599629c6e1352895a66bf27c68c17aeecb0d4d9abfdb8d37d24613ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 5528 bytes
font_01_sfnt_off0000e7ac.bin
995ad4a259a89765e765ef492f97b170162f3da718421f1521cdf1518a71ca46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 9752 bytes
font_02_sfnt_off0001090a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 4324 bytes

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