Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c683ef4c6273ae…

MALICIOUS

PDF

63.4 KB Created: 2020-11-08 12:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aea8f97dd33a76e5418ea47f893e70d2 SHA-1: d81254c56fc67756604a3a66bdbaa7593855ba78 SHA-256: 83c683ef4c6273aed9febbd98d3305e982b93d89231ce5349a125ab367b4be07
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffset.ru/123?keyword=kelly+pitney+comprehensive+problem+1+answer PDF link annotation
    • https://vepaxanejabag.weebly.com/uploads/1/3/4/3/134317352/c8e7fb57.pdfIn PDF document text
    • https://welawebunigekuk.weebly.com/uploads/1/3/4/7/134713971/ravej_fuvej_fofamakusim_fimusuxe.pdfIn PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/wataw.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/sokiranenixagomine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/53901360474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666cc848-0aa5-4c43-b619-a6c17c9732c8/tosoja.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/etymology_online_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/dukemigalozi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/angeles_y_demonios_libro_online.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.pdfIn PDF document text
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.pdfIn PDF document text
    • https://baginalikut.files.wordpress.com/2020/11/amistades_particulares.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.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_off00009d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D49 8236 bytes
SHA-256: 02229c19756f8046f44efe4747acfd2a9d2deca7868169cd24fa9ed8e564e0ba
font_01_sfnt_off0000b848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 5588 bytes
SHA-256: 9ef9ed0fdd5c3f797271b5edda6770261e02042d7bf551c368eadf362a69ab97
font_02_sfnt_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 10928 bytes
SHA-256: 9dac2f67b15687b2a5c742ac73accf1de9fea225801e37abe8a47376fe1a3c40

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