Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9f322e4f1d9ec2…

MALICIOUS

PDF

78.3 KB Created: 2020-11-09 16:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e023e39578c4e9501fbe69737dab0331 SHA-1: 4ce2602fb7250e437e6783a569efd5ffd31c26c1 SHA-256: fd9f322e4f1d9ec24a087c48e628886475bedbf8a0e45db566d1e5486c0b6fc1
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains a large number of embedded external links. The primary function appears to be acting as a link farm, directing users to various websites hosted on disposable domains, such as 'trafffe.ru' and multiple 'weebly.com' subdomains. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its true purpose, which is likely SEO manipulation or distribution of 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=madonna+sorry+video PDF link annotation
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/5061168.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/193d83d10c.pdfIn PDF document text
    • https://vovufopoxin.weebly.com/uploads/1/3/4/4/134466437/6eeecc8a8899.pdfIn PDF document text
    • https://didokizobu.weebly.com/uploads/1/3/4/7/134711826/183752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5fa6dc5e3cb3a.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/eba42e30f.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/xabewokuluxas_gogapuwopaxig_nafuj_zawunitebo.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/870a04b5d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5f9da017ae0ac.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/1904130.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/259b7f691396.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/188bb516-0d48-4b3a-826a-767a93bf36cf/faruwojizebatedalovaxuda.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_off00009a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A88 23292 bytes
SHA-256: aac152c24acec81321af1b23d89742726fdfa9e57cd440d5449970a0dded80cf
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 4956 bytes
SHA-256: c93da95151e672e1d51be61258665d9894bda178fb6fc82ae964656845464986
font_02_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 11988 bytes
SHA-256: 727aa498036dfccf6071230f2d44f1517ef55a8c20cf720fb0c574818576b9e2
font_03_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832

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