Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ed11b2a595ced4…

MALICIOUS

PDF

66.4 KB Created: 2021-03-18 13:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c5ca70c57b14e9b821201764f3f1eb3c SHA-1: 5b8a9fcbc613bc5c56a15f4b4a979e25b8f0542a SHA-256: 24ed11b2a595ced467375d6248fc4daa987720baad0b3f0cc8d3a3a9ed97704f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme designed to lead users to malicious content. The document body, though heavily obfuscated, contains references to 'Dash worksheet pdf' and the authoring application 'wkhtmltopdf', likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/wix?keyword=dash+worksheet+pdf PDF link annotation
    • https://nanoxoxudotu.weebly.com/uploads/1/3/0/8/130814682/guxufemowejem.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/dowadejoxugemm56m.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/64457159091.pdfIn PDF document text
    • https://xusezazidajitov.weebly.com/uploads/1/3/5/3/135325201/kakefofutepi_nupukojije_livojidu.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/19ab9c37af3a0c.pdfIn PDF document text
    • https://xiwogape.weebly.com/uploads/1/3/0/9/130969270/3393865.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/0ad1da458734bf.pdfIn PDF document text
    • http://tedamowajowiw.22web.org/fisiopatologia_de_accidente_cerebrovascular_isquemico.pdfIn PDF document text
    • http://save50.pro/microbial_assay_of_antibioticsb2jj6.pdfIn PDF document text
    • http://nurigufasuvunu.iblogger.org/folikurojevupaner.pdfIn PDF document text
    • https://niliwavinifof.weebly.com/uploads/1/3/4/6/134687551/2f5938baee7e.pdfIn PDF document text
    • http://vojidovalo.iblogger.org/php_form_validation_submit_button.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/fee216e4.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/silifab.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/how_to_make_a_baby_snuggle_blanket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogujigasad.onlinewebshop.net/hypertrophie_des_amygdales_palatines.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/varus_build_guide_aram.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/32835804895.pdfIn PDF document text
    • http://pimorem.epizy.com/fijezexesazigure.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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 5252 bytes
SHA-256: 8969a7125370e230da3166f184292dcabac1548b4ff1ee1dc7827ec9c2c04254
font_01_sfnt_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 10484 bytes
SHA-256: 6155e1e54279809b019ef164cbddde546a930d6e6080ed09c048f27cced5249c

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