Malicious PDF — malware analysis report

Static analysis result for SHA-256 248fb3e953b5adee…

MALICIOUS

PDF

39.3 KB Created: 2020-11-08 10:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 00efed67f1fad62de695e04ccc63682a SHA-1: 9f6a0442e58ac79f556bfe4776b81a89dbe4ef58 SHA-256: 248fb3e953b5adeeb6d1b0bc7edc66e08078dc029d64382bc93491b5e9acc036
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF documents hosted on disposable or suspicious domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its suspicious nature. While no scripts were explicitly extracted, the structure and URL patterns suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafffe.ru/aws?keyword=alice+n.+boucher+elementary+school+lafayette PDF link annotation
    • https://xapukuzikoki.weebly.com/uploads/1/3/4/3/134381416/2386203.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/d878e0b74e1be82.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/basenomajexix-dovafajuziz-gaxupoz-kolapiv.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/bebca78e8b27.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/nimekonax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5fa1e36-7725-4469-8370-acda7723c17b/neleledawoxivilifibir.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/pukoloxutudikadijogo.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://paduduruvaz.files.wordpress.com/2020/11/saperov.pdfIn PDF document text
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57a7f02-4fc1-499e-ae49-668501d4850a/36650932342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3f095a-2693-4701-a5ca-0372a7537d55/vosapoxuripojitopokegizu.pdfIn PDF document text
    • https://nepusin.files.wordpress.com/2020/11/56371377657.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_off00005aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAA 5384 bytes
SHA-256: 36b200562131a9daf293cd9a7a78fff32badb1a11faab310b27448b5148636c8
font_01_sfnt_off00006cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD6 10528 bytes
SHA-256: 87d8e340fbe54a9d9e4902c10ef91ce2e01caa40658e16feb515be7ec8b1a09a

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