Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa2316fa4d739f7…

MALICIOUS

PDF

88.1 KB Created: 2021-03-02 23:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aabc41ac273b96bfbe0a9f0c49263c75 SHA-1: f890a465d1561a978c084e12ab126b05c4acd71f SHA-256: caa2316fa4d739f75545bfc8697ff6d54815815f58a4400b6964921d30559c47
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. The presence of an embedded external URI pointing to 'nipisod.ru' suggests an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/wix?keyword=similarities+between+eastern+and+western+religions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466408/normal_603ce23cb8d4f.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/massy_arias_diet_planclhgz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5ff658ec922b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_6003736875728.pdfIn PDF document text
    • http://damvglaz6.xyz/android_studio_free_learningb0vrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_601070e2762c4.pdfIn PDF document text
    • http://smartcoin.design/50539062406r8txr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5feec70f6a3eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_5ffb925a46ac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490738/normal_5feb6172dc509.pdfIn PDF document text
    • http://nat-yoga.space/966398295392tlh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60305280633c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5fcee4425d2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fe9fdfa06466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fdb0a5c8ffda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/amazon_prime_device_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/advanced_excel_charts_tutorial.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/tipinozafa.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/53882023952.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 5480 bytes
SHA-256: f80441e1d3672624d7ac31dc7ce8f71ce00ab5782ba845c3ec4a935ca0c40e1c
font_01_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 10276 bytes
SHA-256: 2ad554fdc47986f171cbc602210d2d0a95a07d58c4df57ca05e03346566c7f0b

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