Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2b4090636e3906…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 16:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0e808860e93310c1f140eb99cfeae0 SHA-1: 9be2e2b9e1ae4f5614d4389d5c9ef2d74de5b705 SHA-256: ea2b4090636e3906b6bd06f5bf1c18159a48d2aa5d88bbf3c3074d7cec095563
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm designed to drive traffic to various websites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting a malicious intent to manipulate search engine results or direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/award?keyword=sanitary+napkin+vending+machine+pdf
    • https://static.s123-cdn-static.com/uploads/4374853/normal_60091c03ea902.pdf
    • https://static.s123-cdn-static.com/uploads/4369316/normal_5ff9c6577f785.pdf
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/nalami.pdf
    • https://static.s123-cdn-static.com/uploads/4367271/normal_5fcd07a1e695b.pdf
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/serudupulat_jaluk_zufimuzudetav.pdf
    • https://static.s123-cdn-static.com/uploads/4418587/normal_60055d24cfa1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/039160c8-e868-44fc-97fa-e93f2222f5b4/stamina_body_trac_glider_1060_rowing_machine_canada.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_831f601c0725447685cc6eba0cb7637f.pdf?index=true
    • https://s3.amazonaws.com/pibajuwi/kekoxulesisobesavapub.pdf
    • https://s3.amazonaws.com/sazixipame/free_wood_shooting_bench_plans.pdf
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_4793ea029b2548d4b0f2af086ce1f53c.pdf?index=true
    • https://s3.amazonaws.com/dudurat/msi_afterburner_overclock.pdf
    • http://mulagokonud.rf.gd/76241620951.pdf
    • http://difesasud.epizy.com/55028988300.pdf
    • https://s3.amazonaws.com/lolaritemukole/english_placement_test_with_answers.pdf
    • https://s3.amazonaws.com/dutimajizowa/reporting_inappropriate_behavior_at_work_sample.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_7bb616204e6a49a2a99883ee340abb5a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3be6d726-8cb4-47d3-91b6-027b93d2e568/how_to_upgrade_autocad_2019_to_2020.pdf
    • 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_off0000e3eb.bin
d19aac25b992b472aeb8102cd35b1f4c393f5e711d4fb0a3aef933e85eec1555		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 5688 bytes
font_01_sfnt_off0000f739.bin
47876891d779276ca4684b2432566f5132fcd144d9bc115d6d14b650f8ec0c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10148 bytes

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