Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e41ee9e4737514…

MALICIOUS

PDF

72.1 KB Created: 2021-04-02 15:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 776e5aecd52a21e9f7bffc4dffe08a28 SHA-1: de051d4fe7f72eadaf0d93570b506cf4b988489b SHA-256: 72e41ee9e4737514a54b17f006810060e3e7c32694169f0a343a3dde6bd94977
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a mass of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content or to redirect users to phishing sites. The primary URL points to a resource that appears to be a practice workbook, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=glencoe+algebra+1+practice+workbook+pdf
    • https://nupinowag.weebly.com/uploads/1/3/0/8/130814423/kimexogiwoga_nifimi_dowofifatom.pdf
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/de29650.pdf
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/kodotamogewewugizonu.pdf
    • https://cdn-cms.f-static.net/uploads/4402486/normal_6034d7c6d3aee.pdf
    • https://cdn-cms.f-static.net/uploads/4418367/normal_60220b6a931de.pdf
    • https://static.s123-cdn-static.com/uploads/4410214/normal_6006bf1d1e3b5.pdf
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/8917616.pdf
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/2462783.pdf
    • https://cdn-cms.f-static.net/uploads/4500665/normal_60219c835b312.pdf
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60337a5ae1fb3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_d814518131cd498ab38f4b63f2fb8260.pdf?index=true
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_731e2a4e099b4f318b96dff37ac8fb19.pdf?index=true
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_08306832d5a548c397de7c2faee05500.pdf?index=true
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_64c0587c283b44c5b06ddd0ea85232cd.pdf?index=true
    • https://s3.amazonaws.com/limepusotanal/4412781694.pdf
    • https://s3.amazonaws.com/vuzotisenixava/business_office_manager_job_description.pdf
    • https://s3.amazonaws.com/fekife/harvest_moon_light_of_hope_trophy_guide.pdf
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_0a526930a6594142906e9a6634677e3c.pdf?index=true
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_bf2a8207d129469a8395c22d3dfefe4c.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_9d8cf54854d0460482f17acb40dd0c7d.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_off0000dbee.bin
5aab14294f3d6bdede92dda44008b232c6e97baa52c60ca2b3aacf25dcbeabda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 5524 bytes
font_01_sfnt_off0000eee8.bin
f1e72b79a2fcbaf9d00845a07b6b00e5f32946e2a3d32f85d94c4278ab24aea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10684 bytes

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