Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bcdd16a3909948…

MALICIOUS

PDF

73.7 KB Created: 2021-02-15 00:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbb37891e3966d38d26a9df09ac66364 SHA-1: 774034ebe7f920c96f6cf5962d0ae71ecd8f79c8 SHA-256: 14bcdd16a3909948f76cbf9e30e5f2f7b9000e6ca3c50d34919e1c395e4e2ced
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or phishing content through these links. No scripts were extracted, but the sheer volume of outbound links and the heuristic firings are sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=juegos+de+ingenio+chile PDF link annotation
    • https://zisumujabi.weebly.com/uploads/1/3/5/3/135315444/3b32503ad49a9.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/2049881.pdfIn PDF document text
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/242b25f0210b14.pdfIn PDF document text
    • http://voirly.xyz/factors_affecting_photosynthesis_worksheet1eyzr.pdfIn PDF document text
    • https://jolezage.weebly.com/uploads/1/3/4/3/134336692/gimos_gokuzivovubo_xetupanepobuxep.pdfIn PDF document text
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/bapibaji_zidafelakeleze_diveragi.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/dakajipu_ludekaxo.pdfIn PDF document text
    • http://idealica-it.website/botonagotoromozejskkr.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/tateje-refekumat-sumatalujedike-sifetupigo.pdfIn PDF document text
    • http://gloslides.com/25859967720sb9k8.pdfIn PDF document text
    • https://tasepatoravolun.weebly.com/uploads/1/3/4/3/134352318/32cc81ce3c4e0cf.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/a3cd6f6cae01.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/da500d246.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/6f3c36e5e1f811.pdfIn PDF document text
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/368819.pdfIn PDF document text
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/rapuwarilavaw.pdfIn PDF document text
    • http://pumba.fun/heat_vector_quantity_or_scalar_quantityt5tsw.pdfIn PDF document text
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/nikilebedoju.pdfIn PDF document text
    • http://top-salez.site/79824751518fuu4a.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/mageleguxoro.pdfIn PDF document text
    • https://xigologilajuveb.weebly.com/uploads/1/3/4/6/134672854/dixewabipugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 4884 bytes
SHA-256: fe23779764ef6c11eef02e4028968d01b0fc48e279c04842eafa5223192dfd17
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 12296 bytes
SHA-256: 3189ccd1cf4efe0359537fc6884e30bb7e9e7a74ed4a121d52b0ead0ca79d1d3

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