Malicious PDF — malware analysis report

Static analysis result for SHA-256 4addda59051a7b15…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 15:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd62848b21043895d91d2063d40b6a47 SHA-1: b5cd37352233268f7ccb9e662dd949a7a712d541 SHA-256: 4addda59051a7b1570a604227911629b8655e6c2545d909b690f17319081cb0d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of the primary URLs, 'https://jacksth.ru/award?keyword=abzurdah+libro+pdf+online', suggests a deceptive SEO-based lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a potential attempt to redirect users to malicious or deceptive content, possibly as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=abzurdah+libro+pdf+online
    • https://cdn-cms.f-static.net/uploads/4456116/normal_602de3520e1d6.pdf
    • https://cdn-cms.f-static.net/uploads/4453579/normal_5fd7c4c56a79a.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_60405d55afde1.pdf
    • http://flash-sar.online/xutisexapozunirutupqfjic.pdf
    • https://cdn-cms.f-static.net/uploads/4461483/normal_6047df825c803.pdf
    • http://shoplus.info/baxezowilownxo4u.pdf
    • https://cdn-cms.f-static.net/uploads/4418778/normal_6053f1713872e.pdf
    • https://cdn-cms.f-static.net/uploads/4452861/normal_6018aea4abe87.pdf
    • https://cdn-cms.f-static.net/uploads/4424933/normal_601bf9595f88d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_03496b820b404951aa9f721a8e44ad20.pdf?index=true
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_f7e41dacb0eb467aae20c27a90c82c4e.pdf?index=true
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_492616a2e5794deaaa039791218277af.pdf?index=true
    • https://s3.amazonaws.com/xanunafojuloki/cable_selection_for_motor.pdf
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_de9f613deb2d4208950e459785cd7f81.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_0d57318061494159965e2b9aa32b4617.pdf?index=true
    • https://s3.amazonaws.com/womirofop/lofeve.pdf
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_4c24d55f7a134537b336b83d011f5f18.pdf?index=true
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_9fd288e5add34bc5b8e5de4ab1f0bf8c.pdf?index=true
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_f70c479a88864256a68d8966bcc6c639.pdf?index=true
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_1f8773c3555f4ae085f44f82a2d21c7b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f141.bin
124783600628bb7eb8402bfca9deb33404a089c4ccadf29dee1c646b797d279e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 5128 bytes
font_01_sfnt_off000102ad.bin
466d9b19cc4f974cfea975507bb0bfe990d6132b4e416ced2f864e7b1e6856e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 12104 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.