Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f152d0b7a10018e…

MALICIOUS

PDF

94.3 KB Created: 2021-04-06 04:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d155eda4f3cd03c669afeb961d10e09 SHA-1: eca54f10e176e984a9544b8ee0e80f28aa2c20a7 SHA-256: 1f152d0b7a10018e6ac6d1fe03f557f48dde9ee0f5c9a7d2add20a487bfc4d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, contains text related to business growth, likely serving as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing.

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://resalured.ru/strik?utm_term=tips+on+how+to+grow+a+small+scale+business
    • http://lnstagram-blue-ticks.com/what_do_you_understand_by_the_model_of_community_development_indexxz47q.pdf
    • https://cdn-cms.f-static.net/uploads/4401515/normal_606a8f0436c09.pdf
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5fe0c8efea70e.pdf
    • https://cdn-cms.f-static.net/uploads/4385612/normal_6046e5fa82163.pdf
    • http://wejaduz.mypressonline.com/tuzexuvujeliju.pdf
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5ffe8b828c046.pdf
    • https://sutivekawexebe.weebly.com/uploads/1/3/1/6/131636655/3286d6f9.pdf
    • https://static.s123-cdn-static.com/uploads/4470211/normal_5ff4a0a8bb2d5.pdf
    • http://front-glass.website/liste_figure_de_styleffljw.pdf
    • https://static.s123-cdn-static.com/uploads/4481518/normal_6004ed27a4c46.pdf
    • https://static.s123-cdn-static.com/uploads/4428054/normal_600150636a00b.pdf
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/jomatitesigeru.pdf
    • https://cdn-cms.f-static.net/uploads/4490377/normal_60554d780ccb0.pdf
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/544078.pdf
    • http://vipadobotisituz.mygamesonline.org/vikaxojuxejakurunapaf.pdf
    • http://microbestdigitalmeter.xyz/wufatuvawexifanepalujihkqp7.pdf
    • https://cdn-cms.f-static.net/uploads/4370059/normal_601463344010c.pdf
    • http://savineme.mywebcommunity.org/dementia_vs_alzheimer_s.pdf
    • https://cdn-cms.f-static.net/uploads/4485699/normal_601fbabdcc4ee.pdf
    • https://cdn-cms.f-static.net/uploads/4403681/normal_6066f4e368db1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000130aa.bin
527b403056ed267d73d089f908dd4fa677eefb6e97aec3dd506fbb6349e778f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 5528 bytes
font_01_sfnt_off0001435d.bin
75990ab206201ca1ae85fe2a0e1cceb6f696964b1a7066c7a99ef5c2180d02fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1435D 11440 bytes

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