Malicious PDF — malware analysis report

Static analysis result for SHA-256 e784a866814a6857…

MALICIOUS

PDF

86.4 KB Created: 2021-03-29 21:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c6d72b942f5081161fc718601625e12b SHA-1: d887d92ddb1ecbb53047d3c00ff730cb7ac70f1c SHA-256: e784a866814a6857f45dea3f892a4ae2499e7467e83702138416ce2038477e56
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that are part of a link farm, with one URL specifically mentioning 'hillsborough county school pay schedule 2019-20'. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. The presence of external URIs and the nature of the heuristics suggest a phishing or malware distribution attempt.

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://resalured.ru/aws?utm_term=hillsborough+county+school+pay+schedule+2019-20 PDF link annotation
    • http://fojozefamofu.22web.org/42813646561.pdfIn PDF document text
    • http://xomerisupudegop.medianewsonline.com/keto_diet_recipe.pdfIn PDF document text
    • https://tonezukem.weebly.com/uploads/1/3/5/3/135348251/84f42e9a926400.pdfIn PDF document text
    • http://persequenteamsohbet.com/janokawasiqb9zg.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/vapimunerujavivi.pdfIn PDF document text
    • http://sayfelengs.space/how_much_is_a_camera_wortho8plj.pdfIn PDF document text
    • https://ludamezowi.weebly.com/uploads/1/3/4/1/134131800/lagoluwegevatolemiwe.pdfIn PDF document text
    • https://xenizejaruwew.weebly.com/uploads/1/3/4/7/134709329/20ed8990185d8.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/wanoraju-kolerovap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/design_requirements_template.pdfIn PDF document text
    • http://ruxevakeve.rf.gd/inestabilidad_atlantoaxoidea.pdfIn PDF document text
    • http://vapewokadovusa.myartsonline.com/central_hidroelectrica_caon_del_pato.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/22210142632.pdfIn PDF document text
    • http://togipabuwaf.epizy.com/rixokokedujukegasirov.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/apa_style_manual_5th_edition.pdfIn PDF document text
    • http://sefobetibaboxi.epizy.com/math_crossword_puzzle_worksheets.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 6052 bytes
SHA-256: c5f29605147248a2d2f7978c82d51206bac693f840248bd15875193a6d897ffe
font_01_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 11528 bytes
SHA-256: 02209b9e231b3e74188a60b81bcee395a0988ba263d1e1adb6f9300ec6691d16

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