Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab0d9255d3c20f8…

MALICIOUS

PDF

54.8 KB Created: 2020-11-05 23:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fcd0a1761d108e828ce9e4bac406926e SHA-1: 552812f430818bd84f1302e581f1dbc698fb977a SHA-256: 3ab0d9255d3c20f8a50b23f0f0088f508a87156b7a7b09c38808d64d388ebe3e
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The primary URL, 'https://traffnew.ru/aws?keyword=art+history+questions+and+answers+for+kids', is presented as a lure. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to drive traffic to malicious or ad-heavy sites.

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://traffnew.ru/aws?keyword=art+history+questions+and+answers+for+kids PDF link annotation
    • https://xotugakifegug.weebly.com/uploads/1/3/4/1/134131530/961624.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/3877542.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5f9c974634e82.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/pofexotokonadu.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/tuwatewalo_biviwi_wemibira.pdfIn PDF document text
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/fuxor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d558cb6f-9485-41d8-b4b0-48d00ad58d45/82456512873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5797dd3b-14ee-4f84-972a-8b05ee9fc9da/feelings_chart_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72ca502-0e34-4cd0-96ab-5986f4649828/samsung_s5_case_ebay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/kijitedawamopemujemizeje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6686/6843/files/clementine_churchill_pictures.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BE 5216 bytes
SHA-256: cc4d8dfb5fd3d5fc03d1beab94663b4eee5009f06fb712210bae2d11a6ba093d
font_01_sfnt_off00008689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8689 10760 bytes
SHA-256: 0fb09ee14ea3c9ab04f38ff20cb6db589ea7a0d6bd7b9b0e59107b0a005ca9a1
font_02_sfnt_off0000ab5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5C 16060 bytes
SHA-256: 5b45d8957cdd618c0f157c507058aef1810e6158bb3d1abf257796d6008f54d1
font_03_sfnt_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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