Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4570c84694a68d…

MALICIOUS

PDF

74.3 KB Created: 2021-03-08 23:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 240eee1ffaf73fe1951abef91f703f56 SHA-1: 93ae2765c3231f4e03bb2d05a915d1249609796f SHA-256: 1b4570c84694a68d23107be0df7180c6a99e0a6cefb43fb48656888ecd949d90
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, but the structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=amazing+grace+alto+sax+sheet+music+pdf PDF link annotation
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/9416a49879e38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5fca5ccae74d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_600343d528ca3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5fdf10373ea8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fce344cb8eb8.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/wifajuginojojuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_603223792a5c3.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://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_78d463df47404727bdfc3309bf6cb6eb.pdf?index=trueIn PDF document text
    • http://farevuzafi.rf.gd/fimezeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0703f71b-0b3a-461d-bd79-99a6e6e9a1d7/el_prncipe_maquiavelo_resumen_por_captulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790a6c27-01cb-4c02-a909-c82fa93b0d5e/xujofiduro.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_fa3d4ca527154c9d8dec40ef8c3ef321.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_d573fe932a4744acb7018ef84210c886.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_cda0733b294840dead76036b7b930d60.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_6dfa6ab5df6240a28c8ae658a3bd60cd.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_0a388a1dd9f947b3a230450f56ec4e26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/671ef6c2-061f-446f-9b9c-6fda537c2ca1/moginidadob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e595a88-1122-4f71-9385-56bdfdcd54dd/how_do_i_set_up_max_buzz.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_fc4962194c584df6b843cca9dad9176f.pdf?index=trueIn PDF document text
    • http://pizubape.rf.gd/pexifosewenujaberobekoti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 5560 bytes
SHA-256: b0a4e132328e381d25fd6e28a7012b891360b3f564ec5996740609a0d26437f0
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10532 bytes
SHA-256: 8659b1c54005b0fbcc5e0c12e75d80c054b52f1ebd5c141c84b6c9b5ef9ff72a
font_02_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e