Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdd99da98a205de…

MALICIOUS

PDF

41.9 KB Created: 2020-11-06 18:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4adbf0a45139adf1eb9d8dd5389b2f8d SHA-1: 8c6d0481a9973323b5522c1d3673123750181ab4 SHA-256: 1bdd99da98a205de1837364180e54ec6a4600ac7b24eb3ca91c9758f74fe9a71
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by an ML classifier and contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the embedded URLs, 'https://trafffe.ru/aws?keyword=major+wind+belts+on+earth', appears to be a lure to disguise the malicious intent. The document's structure and the presence of numerous external links suggest an attempt to direct users to potentially harmful websites, possibly for SEO manipulation or to host further malicious content.

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=major+wind+belts+on+earth PDF link annotation
    • https://zemodeviwiteg.weebly.com/uploads/1/3/4/3/134351550/vonepugotu_rixobaviwakixi.pdfIn PDF document text
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/5891344.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://kodupupagunoj.weebly.com/uploads/1/3/4/3/134314474/f2593df.pdfIn PDF document text
    • https://rofetavagamufup.weebly.com/uploads/1/3/4/3/134373504/800c83652885.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/dejebozivot-zonupobip-tojizixebubege-xewapasuvapu.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/zezetinal_toberije_padinep_bufekamo.pdfIn PDF document text
    • https://tovoginimu.weebly.com/uploads/1/3/4/3/134379987/6702597.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/4264387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f87d4694be22.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/pererasunob_bixawuzapag_latikopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5fa3c181aca98.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/tadovu/formacion_del_ateroma.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/75802410818.pdfIn PDF document text
    • https://zogidadovo.files.wordpress.com/2020/11/6709642518.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.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_off00006781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 5224 bytes
SHA-256: c7e89c204ccad937ade813b50e4b8aebc38a3847b264f46d672d8f5bcc3708ae
font_01_sfnt_off00007953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7953 9828 bytes
SHA-256: 6f528b87f2eefcacee4996a8b6c69dad5e0e99f36847f113b7b07f6d490e4679

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