Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3f93f962931be6…

MALICIOUS

PDF

67.8 KB Created: 2021-03-21 05:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 763410b304176b57e01e18e53ec441fd SHA-1: dcdeaa9611273931227b36706974da53690931f7 SHA-256: 3c3f93f962931be65db6606eb9eb9154706ce246dc05a512751695c0ceb0c8b1
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document body, though heavily obfuscated, suggests a lure related to educational content ('chapter 55 ecosystems worksheet answers'). The presence of many links to disposable domains and potentially malicious URLs supports the classification as a phishing or malware delivery mechanism.

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=chapter+55+ecosystems+worksheet+answers
    • http://habirovradik.ru/sandra_hill_rough_and_ready_dramatic_reading2j4hc.pdf
    • http://copytoshka.ru/55173727589rn9cr.pdf
    • https://cdn-cms.f-static.net/uploads/4422918/normal_6049b0e6a5185.pdf
    • http://taher-tcac.com/synthesis_of_copper_iodide_lab_reportz710a.pdf
    • http://wejowadizabudex.mypressonline.com/emergency_care_13th_edition_chapter_2_test_answers.pdf
    • http://watogoda.mypressonline.com/1945814969.pdf
    • https://cdn.sqhk.co/fakosopalo/gridP1H/real_football_2015_download_java.pdf
    • https://cdn-cms.f-static.net/uploads/4454055/normal_600a23044a600.pdf
    • http://kartaidatodemeleri.com/lawaralekibexulasiru45fj.pdf
    • https://static.s123-cdn-static.com/uploads/4443576/normal_5ffe5634cfd21.pdf
    • https://cdn.sqhk.co/puxedimuwo/bBjiihd/spinal_stenosis_causes_dizziness.pdf
    • https://static.s123-cdn-static.com/uploads/4417419/normal_5ff9318a43a0a.pdf
    • https://cdn-cms.f-static.net/uploads/4411512/normal_60342afbf136f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kapizepaninufo.epizy.com/ecological_succession_practice_worksheet_answers.pdf
    • http://wubiwasomiduxi.epizy.com/14142875330.pdf
    • http://zakivijojinikij.epizy.com/tv_cricket_live_streaming._apk_free.pdf
    • http://fuluxewamotate.atwebpages.com/kudagogugijiwu.pdf
    • http://sonasekofuxix.rf.gd/ae_templates_free_videohive.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf97.bin
d6874d4d65f8f3c73c9f64647beeee5ac1d11478e0f5ad093b2ee66a21368847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF97 5288 bytes
font_01_sfnt_off0000d181.bin
207d3828b18b847f5622d01f9eaab55a4de77e055cf56110d2f20b36dfbb8589		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 9516 bytes
font_02_sfnt_off0000f220.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 4324 bytes

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