Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cba39f02254448…

MALICIOUS

PDF

70.3 KB Created: 2021-04-08 04:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d038dd241a9614ccaedf6d3cf8610d05 SHA-1: 7a2f0ef72470ae7c7a4357d33a4edd054da13180 SHA-256: 34cba39f02254448c455a7d81cec8e4b7475dda397957c7ec58344665bc87f72
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of external links and the PDF structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=scuba+suit+inflation PDF link annotation
    • http://rowefuzoj.mygamesonline.org/11634419007.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/31002d811e.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/4113873424.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/4963051.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/modilaxumaxerajereneturi.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/angle_bisector_theorem_proof.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/lisetowefipose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejanifezilo.atwebpages.com/biological_classification_notes.pdfIn PDF document text
    • http://wirileso.epizy.com/78112198775.pdfIn PDF document text
    • http://mutomipana.rf.gd/78065062816.pdfIn PDF document text
    • http://sufazomewugexu.epizy.com/79330494454.pdfIn PDF document text
    • http://jofiwevamixeta.epizy.com/ucl_dclinpsy_handbook_case_report.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/tipeda.pdfIn PDF document text
    • http://litegukutudam.epizy.com/34397444926.pdfIn PDF document text
    • http://fitariruzazu.epizy.com/73031196130.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/16936516621.pdfIn PDF document text
    • http://gupepitasaxisal.epizy.com/falojedidurokorekozu.pdfIn PDF document text
    • http://xodupope.epizy.com/java_tutorial_for_beginners_using_netbeans.pdfIn PDF document text
    • http://kakavogulogij.onlinewebshop.net/best_reader_app_for_android_phone.pdfIn PDF document text
    • http://zidukimozefuz.rf.gd/delejowufu.pdfIn PDF document text
    • http://wozetarep.rf.gd/92506380516.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/mn_rules_of_evidence_807.pdfIn PDF document text
    • http://dolaregasa.epizy.com/jexadalitomozegofuligegex.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_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 5024 bytes
SHA-256: 7e72fdbde30d02b244d0a2b8bb6eb8783f537d0cc6a29d182814a8e568d97e5a
font_01_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 13008 bytes
SHA-256: 5c12e44823541c65d492ebdfbb5f7b9cfe7cc9e2cc6cff5977fe1570ee8832fb

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