Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eb0f78c9e5b2fd…

MALICIOUS

PDF

81.0 KB Created: 2021-06-06 09:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6b5ca90222df0021360b0f296f871994 SHA-1: c5c73fcbeab8443568f46ff562e96fa6a7337fd9 SHA-256: b0eb0f78c9e5b2fd34f2943bed86c062450e0f786f93bfb7443a515646603a6d
126 Risk Score

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 0.9990

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://coretry.ru/pbw?utm_term=kostenlose+fahrzeughistorie+%25C3%25BCberpr%25C3%25BCfen PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4379374/normal_60b38d8cd2a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_602c8cbb4d48f.pdfIn PDF document text
    • https://wobikuneli.weebly.com/uploads/1/3/2/7/132741052/boxesogosolesanimux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fda560c285f1.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/fafibisud.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/68b4c2f930.pdfIn PDF document text
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/kipipagad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_6047135e84382.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/meripu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5fd869a3ce9a8.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/vikokeweguriva.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/pisutujudaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebenuziwi.pbworks.com/f/stakeholder_theory_of_corporate_social_responsibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed95d8e-0f93-4983-aae3-ff2aa78b4ce8/color_theory_meaning_in_art.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144444837/who_were_the_four_rightly_guided_caliphs.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144470313/how_to_hack_nitro_type_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71564bc-c93a-442e-bd01-48324c4d5fdf/mubegurinawuwelum.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/86544356968.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144520869/7287790220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c374a62-48e3-4c55-b6aa-7064563306ba/types_of_chemical_reactions_worksheet_answers.pdfIn PDF document text
    • http://xutipofapu.pbworks.com/f/68326944684.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/f/34880125605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e941ea58-565b-4bfa-821f-666ee83c336f/venta_de_bombas_de_ariete_en_puebla.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144649827/salixigelaroxokif.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144577602/ansible_windows_file_copy.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 5440 bytes
SHA-256: 03bf5b892fb9163d32912c8fea3f9d16af70858a1eefe5d10fb9be34d7c77c96
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 12136 bytes
SHA-256: e82b65db4385bfd34bf2b9849c2b66327e00e0ce0b42db423bc5a29ad0663bfa
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd