Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a80995b9ce48a…

MALICIOUS

PDF

33.1 KB Created: 2020-11-06 14:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7ba5be4a14aaf1bc5f6d0ad61070a480 SHA-1: 526dd267deba946685c15f070cfd7bbc1e2cd5d3 SHA-256: 888a80995b9ce48a0489b4021d965f9bc8f1921bd699a40d2033d4ef9ad4a503
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the presence of embedded URIs and the overall structure indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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://trafffe.ru/123?keyword=proline+pool+filter+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f8ec4d5a3ff7.pdfIn PDF document text
    • https://butebipibib.weebly.com/uploads/1/3/4/2/134265815/4506636.pdfIn PDF document text
    • https://rogumine.weebly.com/uploads/1/3/4/4/134448770/4cb6668c61eab.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/bezutu/kelly_kindergarten_homework.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ec52be-c3df-4ac7-839d-f8ec2ba13a6f/38837387659.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/didemimarataxixe.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/puxagonifutati.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/voluperakumev.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/sonia_sotomayor_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/jitudafuvufipejupat.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/warriors_omen_of_the_stars_the_last_hope.pdfIn PDF document text
    • https://s3.amazonaws.com/tenoxitonipuw/meaning_of_upanayanam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ba4bf4-cb16-48c4-abb3-cf42cde0f7d8/todejajamim.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_off0000458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x458A 4872 bytes
SHA-256: 403ab58c918049d7a777e2acc77da3afac4e29a1e7448cce76dd1d132ed43286
font_01_sfnt_off000055ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55FF 9852 bytes
SHA-256: 509f4648b9285d03eee3f347785026c30212390b510b5732339139f1cfe0efa0