Malicious PDF — malware analysis report

Static analysis result for SHA-256 b755cec51e1ef376…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 22:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c58e65389187da3a9990a90220c9ae8b SHA-1: c35aa9a4a91946cf3f0b1ade42767bfc6dc34b87 SHA-256: b755cec51e1ef3760a80849f862b5ecdf14b21df3dafdf6ed7927e7e22494cbd
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=fossil+q+explorist+5.+generation PDF link annotation
    • https://cdn.sqhk.co/duwutawuna/ZEMgdig/ansible_advanced_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/PlGieia/53947459980.pdfIn PDF document text
    • https://kajavowonedefa.weebly.com/uploads/1/3/4/8/134858644/6845718.pdfIn PDF document text
    • https://jizidetaji.weebly.com/uploads/1/3/4/6/134626841/6485974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_600bef4c1cc90.pdfIn PDF document text
    • http://melukutirigap.22web.org/31710572474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_6051794514223.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/siehicm/beautiful_images_for_mobile_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/048a382b-3388-4e59-843f-770c14aaa0fc/fokepotubibobipovem.pdfIn PDF document text
    • http://faxiwig.epizy.com/informacion_plusvalia_municipal_ayuntamiento_de_madrid.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_026913d9032a45e48f2235ac326e680c.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_1168c881b8a747368eece62860731fa4.pdf?index=trueIn PDF document text
    • http://borovob.epizy.com/android_one_power_review.pdfIn PDF document text
    • http://powupavosugujiw.epizy.com/boyd_convex_optimization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bad0601-fdb1-4c27-bc7b-3e224f768f07/roku_model_3920x_replacement_remote.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_db084bf3bbbf49f7a1076f0596a1c026.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dead489-7087-452f-8c5d-504015e8c4b6/letra_y_musica_del_toque_de_bandera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee6e90a-5a0a-4825-80ae-6697a3aa4091/tevarorexaxunonikoguwefuf.pdfIn PDF document text
    • http://fizufizobizud.epizy.com/dosiwokisixugigu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 5292 bytes
SHA-256: 525d0e782f1fe65b484f84d211d46a8e9b00972ce64825f77cdb5368bfc5c23d
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 11092 bytes
SHA-256: 3d4a4eef1e87e97712f1304ab1beb583ef229aee8dd1ea5bf294c54317aa3ce8

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