Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbbcd6362ecae55…

MALICIOUS

PDF

74.6 KB Created: 2021-03-30 09:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e0652a426065d6f047f5b49a1720b20 SHA-1: 8e8c3da24c862577df8de27cbceadb6f182b17f8 SHA-256: fcbbcd6362ecae55352eb89f3dfc92b2394aca0c7d3ebba50316d0f4280a09fc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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.
  • 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://dafemum.ru/strik?utm_term=sharp+el-1801v+paper PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5ff142b309413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_5fea443851fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_604825f630249.pdfIn PDF document text
    • http://cmbmarketing.agency/gopalogovuxuxjgr4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60619be38cb48.pdfIn PDF document text
    • http://burrrhey.tech/sidoniwo4xhnh.pdfIn PDF document text
    • http://kzrovk.xyz/68442009085cvygx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_600cd00407505.pdfIn PDF document text
    • http://ig-support-service.com/82109726534p3v4u.pdfIn PDF document text
    • http://forkidsshop.online/nordictrack_commercial_2150_manualphc8b.pdfIn PDF document text
    • http://autobaff.xyz/780111026334xrmm.pdfIn PDF document text
    • http://winclean-shop.space/driving_school_2017_apk_mod_iosvwrfv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvodadixasiz.epizy.com/97996993491.pdfIn PDF document text
    • http://loxototo.epizy.com/datasheet_view_access_definition.pdfIn PDF document text
    • http://tuwokagiwan.epizy.com/sifitufopomatinaminusorod.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_36919d2d968a4a84b26e1c6a2d5f4da1.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_69a3534441354b05a62621436a691d23.pdf?index=trueIn 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_off0000d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 5312 bytes
SHA-256: 26b9117a14ff42254d00d6f590b86fb2309492a5a7104754bd0ca038113f594e
font_01_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 10504 bytes
SHA-256: a7e89feddd52af3f4395ce6181dab0eba0167d8ab5af4bc611733a9e435eb6df
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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