Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a836d3c02b75bf3…

MALICIOUS

PDF

73.4 KB Created: 2021-02-27 04:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6e4e8495a02f966a8083ef1d0244a1b2 SHA-1: 030ed74140f7eea6a0c8015d3368604bc0498131 SHA-256: 8a836d3c02b75bf3051628fdda1e1be5efc4e15cd027f52333597a64c85fe1ef
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains and link farms, suggesting a phishing or SEO manipulation scheme. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/wix?keyword=food+web+day+2+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9ee44567.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/effect_of_sugar_on_yeast_fermentation_experiment.pdfIn PDF document text
    • https://fiketizi.weebly.com/uploads/1/3/5/3/135387405/nixiba_xobotoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_6027c19f4369e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_602ca5d99d8c4.pdfIn PDF document text
    • https://kefileke.weebly.com/uploads/1/3/5/3/135392356/1927313.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/ebc18142414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5fdf7a5cc8ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_5fd0aaf64950a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374540/normal_5feb7eb54db1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_5fe85b6b4488e.pdfIn PDF document text
    • http://manovina.mypressonline.com/como_paso_de_gramos_a_mg.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/xapepetobivuwerazu.pdfIn PDF document text
    • http://sarepoxorak.22web.org/97113732424.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/zimimike.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/most_common_java_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fe75d1cd38cd.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/shadowrun_2nd_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bixodog.rf.gd/sql_server_2017_express_complete.pdfIn PDF document text
    • http://validexa.epizy.com/jixuv.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/werulogodazevaperupofemis.pdfIn PDF document text
    • http://gusutawidike.epizy.com/dupufesoleti.pdfIn PDF document text
    • http://devevemiwu.epizy.com/roland_xp_80_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 5104 bytes
SHA-256: f13204b58a5ac2c19556e0185b862e3a0d99a10bb9ec7c5dce06e226a430a767
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 10808 bytes
SHA-256: 3bd8433ebcb8de6ff1d9a6327f99b758ee60eeb97c49099c0c9e437193f622fe
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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