Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e5a429729eada0…

MALICIOUS

PDF

180.2 KB Created: 2021-03-19 16:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 088d958d25365d617ab90af5c56b26fd SHA-1: 9c8db71bdb1ff06394a4820da787c7e06a3ffea4 SHA-256: c6e5a429729eada012a532df32b1dbf38f09b3f03e4ff3c128686b8474ae5099
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://jacksth.ru/award?keyword=buku+yasinan+pdf PDF link annotation
    • https://cdn.sqhk.co/tinolefowi/jj2Csxq/zejanowuzefitajolop.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/iJhaBhh/child_care_resource_and_referral.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_600797094b364.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/igfgjaW/miloponotikuwuvoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5fc9cf9c9326e.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/emhcgf3/kokekaviberifarimof.pdfIn PDF document text
    • https://cdn.sqhk.co/woragumokewi/ijehiDY/fevupiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_b9143a22ddcc42d49d0360db5a162935.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9ea8d7-eb8a-4ac3-ae84-5f350a626027/xurolekaxupekar.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_b81746bd5e3d41d7b6951e2fdafb3549.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_9d7a8663a04141e4bf7b3eee0f2e8955.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_f5ea2a97af4a497f925da8a1c9ed40f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/628f2615-ed77-4faf-9772-fa139a591b70/char-broil_tru_infrared_grill2go_x200_grill_parts.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_7409a0e102404a0ea6f22f1faf4e17c5.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_b6f60fb8b1fa449e877d234b80e8706c.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_8d650ffc1b4543b39db0c08cc98c0818.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_653a81389f6d4e88a0fcfdec91a265a4.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_fdde4a6d3e614775a73ac6b0792c3043.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_e10c690667174fea9b07f69784f83e40.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_374c6279c4a04621abc75cf6798f80c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3d0303-3e70-4687-88a5-5719d11ab049/kabized.pdfIn PDF document text
    • https://166fd6fc-b342-4bd2-abbb-a58a2e42959b.filesusr.com/ugd/b56239_4736fa5789934a199c2b7746ee69c713.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bade39-fab3-46d3-9b64-b5a89aa6f513/72453514863.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000286d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x286D2 33932 bytes
SHA-256: f8976e9c68b770794ae009159af8400e452beca5cd61e142a12d8240b02b235b
font_00_sfnt_off00025087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25087 5120 bytes
SHA-256: f9f752d1f49c6653a0eea439d7d09015d813c5a1455b50581eba81afa90e0d34
font_01_sfnt_off0002621e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2621E 10708 bytes
SHA-256: 016340d6ac66d9480ff6d9f1c7eb798f84ab354c30a9b1a26d22a299e8982dad

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