Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92dcb2dfc030ffe…

MALICIOUS

PDF

78.4 KB Created: 2021-03-05 10:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e5a8f06a0fbf4576eefe75077df56e SHA-1: 18737058379d8aa3359a6cabbcdbffcb864e0edf SHA-256: e92dcb2dfc030ffe17ce7da44ac0aeb5e3842e534c6c9efec1598f4a1fe6bf05
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no explicit script was found, the PDF structure and embedded URI suggest an attempt to trick users into visiting a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=how+to+know+my+zodiac+sign+by+date+of+birth+and+name
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fe26af7d3592.pdf
    • http://classicalnaturally.com/sozaluganisojedvec4x.pdf
    • http://apelsins.space/wuresetigemufosigigugufoh2996.pdf
    • https://static.s123-cdn-static.com/uploads/4445333/normal_6008c096848d8.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_60125f5c5e962.pdf
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fe3bfad55b91.pdf
    • http://get3creditscores.info/ruins_of_azlant_glass_cannonojob7.pdf
    • https://cdn-cms.f-static.net/uploads/4451217/normal_601f618f012dd.pdf
    • http://betijeduw.getenjoyment.net/70348032284.pdf
    • http://gikilebi.iblogger.org/gexarodadekidavedat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fovezewi/what_is_medical_claims_adjudication.pdf
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_7b20c4d14c684a0fa5e2a7262a29217e.pdf?index=true
    • http://fusizizugunu.epizy.com/fogonufodava.pdf
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_95db885f7b5e4472a7f5f87dfac52cac.pdf?index=true
    • http://pabewuvuxaf.onlinewebshop.net/7364493103.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_2c07422ecf9e448db80ae07f09b2a78c.pdf?index=true
    • http://fixidil.atwebpages.com/tolep.pdf
    • http://tukekutiwele.rf.gd/6724837046.pdf
    • https://s3.amazonaws.com/lijopavexanuse/educating_psyche_reading_answers_ielts.pdf
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_db79c01a05084cde81ebb00da38677c3.pdf?index=true
    • https://s3.amazonaws.com/pazerogasarinu/nudenededimurefetu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e5.bin
a15e75acf9fd76b73eb7a97217cedf1633716ea90646a3542b679d2cc15855b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 5812 bytes
font_01_sfnt_off000106a7.bin
c1a0a78e7359be63569acc6b89244b1cc8f994b85b81db473c075433dd98c822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 10932 bytes

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