Malicious PDF — malware analysis report

Static analysis result for SHA-256 d518ca32bf064ef8…

MALICIOUS

PDF

82.8 KB Created: 2021-03-17 01:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4b6354f4510a1e7fbf4d95f7eb825e13 SHA-1: 8e0d8b668e26660b65ea3e0be325afbabc708691 SHA-256: d518ca32bf064ef8ebc4e01801936a494e1bf4652e51bd2d2b92085f6404b5f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The embedded URLs are likely used to redirect the user to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=kptcl+notification+2020+pdf PDF link annotation
    • http://nexekeb.iblogger.org/cartoon_movies_new.pdfIn PDF document text
    • http://fipixavonusin.iblogger.org/can_a_sprint_samsung_galaxy_s9_be_unlocked.pdfIn PDF document text
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/kolofovuruwa_kovipegiwaw_rubizonuxizif_tadipuxamade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fe4ba4eb6a85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451744/normal_600518ba9c32f.pdfIn PDF document text
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/lufuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6041eecc47ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_603a5fbf7279f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://nerigob.epizy.com/nice_guidelines_stable_coronary_artery_disease.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/pezevopudigosu.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/21060926247.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/disability_allowance_form_winz.pdfIn PDF document text
    • http://golemibafub.epizy.com/sojaxobuvanegixe.pdfIn PDF document text
    • http://lojawesepex.rf.gd/73187850119.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/55725703168.pdfIn PDF document text
    • http://fefomuk.epizy.com/tabif.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/abandono_animal_en_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/93906370523.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/adobe_flash_player_android_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/bypass_uploaded._net_limit.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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 5120 bytes
SHA-256: d4d3dbfedbf6beeda5f06a1cd2d3d8303a14e3fea357fee217182f1dd176f8a1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 10836 bytes
SHA-256: c6b4e3ca29cf6170156999b493c87bf961075fb3f69fed934ddca7d75828321a
font_02_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 7156 bytes
SHA-256: 1e8446b166bb400ede7e2b7bf20fa98bbc80526c6c6548bdcd6e8236ffffa6ce

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