Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0efdb8595ef7f00…

MALICIOUS

PDF

98.8 KB Created: 2021-06-05 02:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fec1cca910b466bc79bd64f5c11c120a SHA-1: 5a078d1bc75ebf0ed38f25e95466e4c20b8b7009 SHA-256: b0efdb8595ef7f000e4a9f0a996df57484a1d56956154d2591cfd4c936322b07
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 0.9994

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://pistant.ru/pbw?utm_term=resumen+del+libro+tu+momento+es+ahora PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459631/normal_60344dd5b89ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fe190f27f46a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_60245f19d5592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_60681cb80ef55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144463668/faire_pousser_les_cheveux_crepus_de_ma_fille.pdfIn PDF document text
    • http://silasofinat.pbworks.com/w/file/fetch/144633291/kitixumup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed14a10-0639-4460-8146-d5fa6dcc4bf6/xutulizewisasupivaxe.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/29577383576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658d25c9-ede1-4ca9-a686-d6953e8b9653/27875359822.pdfIn PDF document text
    • http://togusan.pbworks.com/f/85491153343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a504972-743b-435a-9612-3979042141b2/xuzavobolawopi.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/f/53940848806.pdfIn PDF document text
    • http://pesivop.pbworks.com/f/95742522037.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/f/47391540107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb0f162-d46c-4301-9d56-ff89d3225a2f/modelos_de_comunicaciones_internas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469fa473-878a-4e50-9602-20e0ac368f13/hp_w2207_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8c4d1b-4a77-4a4b-aace-098ebdca5f9a/nodaxorolitijanig.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/dragon_ball_super_manga_current_chapter.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 5092 bytes
SHA-256: 729ac26ad79d0fbc0503d56f7e2fa649c0533b972a6189f28708b82b9d5e34d4
font_01_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 12864 bytes
SHA-256: a8c33baf4a10e707ec93fa0f25454869fa8721ad4fd770d05713e3ebf79b5bd0
font_03_sfnt_off00015829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15829 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_04_sfnt_off00016d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D56 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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