Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f3546ea8d2547c…

MALICIOUS

PDF

81.6 KB Created: 2021-03-28 11:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f1c264acbf03a86d43eb111aa3c129 SHA-1: 50430db4ea0e574e67d9ad8979973cd1e43a01a1 SHA-256: f0f3546ea8d2547c10d36281ff1715eed6318e8052c55f903d6cf1e9dfbe8428
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated to appear as SEO-friendly content, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document, possibly leveraging embedded JavaScript for exploitation.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=bipartite+graph+pdf
    • https://cdn-cms.f-static.net/uploads/4413862/normal_6025e1e578d0c.pdf
    • https://cdn-cms.f-static.net/uploads/4495684/normal_603b628bebc98.pdf
    • https://static.s123-cdn-static.com/uploads/4489992/normal_60055758e7543.pdf
    • https://cdn-cms.f-static.net/uploads/4385847/normal_601dc90be28cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zarevizebi/busybox_paid_apk_free.pdf
    • https://s3.amazonaws.com/fedufiporara/songs_of_kesari_movie_free.pdf
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_7a91550ef7be43acac84086f9b9eaf22.pdf?index=true
    • https://s3.amazonaws.com/jozaponi/rain_bird_5000_manual_portugues.pdf
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_f8dade9768644adbbffa2f18f8b15c13.pdf?index=true
    • https://s3.amazonaws.com/gajabedafot/apr_calculator_excel.pdf
    • https://s3.amazonaws.com/bopuxosavubare/48211522535.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_0f1038ce465148f2b3c1fa644f218d0b.pdf?index=true
    • https://s3.amazonaws.com/remeranexe/bernard_marr_key_performance_indicators.pdf
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_42c1e8b033074e94adb5a66f952f0bb2.pdf?index=true
    • https://s3.amazonaws.com/pubopelej/54522306412.pdf
    • https://s3.amazonaws.com/sabegokek/wasizo.pdf
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_2c59c933258d4f41a7e66ac466ad1dc0.pdf?index=true
    • https://s3.amazonaws.com/kaxukok/72676566554.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_b046c503f640466aaf03f5f2f8986e8f.pdf?index=true
    • https://s3.amazonaws.com/mokixetat/6739093329.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d7.bin
0b1fe031dfd24931dd77b554f417c8134cacdf5b4f01da3f2e71f1bc71e07da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 4712 bytes
font_01_sfnt_off000105ee.bin
d68e95f5fa2b0164b8afaec9c655411774d07cfafbea4ad35fbcf00b1da44909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10796 bytes
font_02_sfnt_off00012ae5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 4324 bytes

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