Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcfba69c84024b9…

MALICIOUS

PDF

78.9 KB Created: 2021-03-12 17:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a41ab45f094da578af3f598aa409df4 SHA-1: 29b04275315d9d5383307577a6843aa30cb8c8b2 SHA-256: 5dcfba69c84024b9589f9f510d4cca62ed8be9a9ae69a4521c389b76f5127ea3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, with a primary suspicious URL pointing to 'resalured.ru'. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to passing security exams, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fastest+way+to+pass+security%252B+exam
    • https://cdn-cms.f-static.net/uploads/4475989/normal_60325c1e1b462.pdf
    • https://cdn-cms.f-static.net/uploads/4417305/normal_601445259033e.pdf
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6042d72133427.pdf
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fef6edf6931b.pdf
    • https://static.s123-cdn-static.com/uploads/4485942/normal_5fcebe9be08ee.pdf
    • http://jalazekesofijot.medianewsonline.com/66636799454.pdf
    • http://sawemawe.mywebcommunity.org/88275423161.pdf
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5fdcaceaac97a.pdf
    • http://nigavereke.mygamesonline.org/povarunutete.pdf
    • http://lagulesuko.medianewsonline.com/47371939556.pdf
    • https://cdn-cms.f-static.net/uploads/4470205/normal_6014da4f7c4d4.pdf
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5ff99126c658f.pdf
    • http://zitugaxusi.mygamesonline.org/16750113294.pdf
    • https://cdn-cms.f-static.net/uploads/4368486/normal_602ed27037acc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_c4c81304d95148338e381cb88279991a.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_3a266d614105457a97d531d6d46e1a28.pdf?index=true
    • https://s3.amazonaws.com/tugabijenovili/65480746584.pdf
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_22555fadcee745f8852c1d081aca6d2d.pdf?index=true
    • http://kerakuwopimarin.epizy.com/37323827442.pdf
    • http://famuxigoram.epizy.com/silupumujake.pdf
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_f6ef1f40b2df45e7b2d979440c930e90.pdf?index=true
    • https://s3.amazonaws.com/sewamos/silidenuweb.pdf
    • https://s3.amazonaws.com/xilasisefi/fundamentals_of_accounting_2_deped.pdf
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_0e90f19103bd40328ce175849816fb88.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_off0000f6e6.bin
44886e10a8d99d4437b7ac900323b67ee20be82fc3f47f9f250cfcc3f49f8933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 5264 bytes
font_01_sfnt_off000108d6.bin
e286f12481f13831c8c812431cde24e7fa36970836b48be19b52c66cad46b7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10940 bytes

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