Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a2c770263a365f…

MALICIOUS

PDF

68.3 KB Created: 2021-02-23 07:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c77298185dcc2a2f74b37eca01f4dcd3 SHA-1: 775ec2a380d61ee9b061ec9d0deaf9b5f62a1816 SHA-256: 14a2c770263a365f4443832485cdf2234fa58501393d8f9964055392f9ba5ea1
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a malicious intent to manipulate search engine results or distribute malware. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the presence of multiple suspicious URLs points towards a phishing or content distribution attack.

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://seumenha.ru/123?utm_term=computer+system+parts+and+their+functions PDF link annotation
    • http://kadabafomelu.66ghz.com/xirumozurixav.pdfIn PDF document text
    • https://nuzalegexokoz.weebly.com/uploads/1/3/0/8/130814177/dijozijamavido_notejadogezek.pdfIn PDF document text
    • http://lady-bug.club/703877829465v2ij.pdfIn PDF document text
    • http://naturaleone.space/satolareturccfb.pdfIn PDF document text
    • http://guvinesusavilo.iblogger.org/novikopovagebagosalaxodub.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/vesusegobow.pdfIn PDF document text
    • http://optalpha.com/flesh_eater_courtsrekzc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigavolaxo.epizy.com/76817738488.pdfIn PDF document text
    • http://wixufoliwesomep.epizy.com/jaynes_2003_probability_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/81212582114.pdfIn PDF document text
    • http://kitalanexu.epizy.com/florida_sentencing_guidelines_involuntary_manslaughter.pdfIn PDF document text
    • http://fewuzefar.rf.gd/gestor_de_archivos_huawei_apk_2018.pdfIn PDF document text
    • http://texegap.epizy.com/ipad_mini_2_size_vs_ipad_mini_4.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/1n4148_zener_diode_datasheet.pdfIn PDF document text
    • http://gixisenusadat.rf.gd/how_long_to_mine_for_1_bitcoin.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/kovirowi.pdfIn PDF document text
    • http://vudutetadi.epizy.com/11329109091.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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 5368 bytes
SHA-256: 6886a8c75c35d828e8b304bec2595ff2da6471bc7c05a85b693bd3908220bb28
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 10460 bytes
SHA-256: 5f8d0464d887f17bde1d19019fd654723872fdafc95a243ffaaf94f3bcd63cd0

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