Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2d4e442689d6ae…

MALICIOUS

PDF

76.6 KB Created: 2021-02-16 01:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: db9faedb24c4eb0de77c4b34ca157958 SHA-1: 60b985a991e6b21331fa1310193f2ddcffe869a0 SHA-256: 7c2d4e442689d6ae7c116d9cdacf4a455865e276571c039f43e852038eccd69c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ML classifiers as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=db2+return+code+8 PDF link annotation
    • http://train-home.ru/gimej9lozs.pdfIn PDF document text
    • http://reduslimitalia.site/laser_cut_cube_templateyj93y.pdfIn PDF document text
    • http://homearfes.com/nojupobenol67j.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/XVhijge/55019351890.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/dFja7gi/easy_checklist_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/hdShbcT/air_force_air_traffic_control_school_length.pdfIn PDF document text
    • http://matcobzor.ru/vopepo0883g.pdfIn PDF document text
    • http://ostanni.fun/lisakuvetukotaguwedopokibdp0c.pdfIn PDF document text
    • http://xazivigufimu.22web.org/32203561965.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/ghgBhiX/60576688722.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/hjjifgg/yoga_108_bali_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/uggBghV/dove_channel_app.pdfIn PDF document text
    • http://zoneeuro.pro/firefly_luciferase_reporter9kac5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/xamagigoret.pdfIn PDF document text
    • http://zofekaxezujujom.rf.gd/relation_of_voltage_and_current_in_transformer.pdfIn PDF document text
    • http://betupaxomivokab.epizy.com/vowelesovogibesawaredo.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 4980 bytes
SHA-256: e7375f12751db1982f9b18cc2e014149ed4de5f5ef5320851c55d43486cd43cc
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 10556 bytes
SHA-256: fe7c60c001339392f8f37c735dfb7d851116d827861569cf31f765be441a9ba0
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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