Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cad53857f9d10ca…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 20:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 783fdbbc1d9a1bd65ab37fad644a2768 SHA-1: eb9b6e4b9872a277d4752ef4cb4fcf89fd0a300c SHA-256: 5cad53857f9d10ca8311c7f20448d64905e5d4448c04ace4ff27171afb43cecc
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wix?keyword=halo+reach+no+picnic+achievement+guide PDF link annotation
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/dd6137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_6018393dde516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5ff50ee98b0d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5fdcb4d48cd0a.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/vagefoximimavo.pdfIn PDF document text
    • https://ratudizog.weebly.com/uploads/1/3/5/3/135323835/kogadalesojilejekeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_604057abaa6b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_6018bbe04ec9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fdb605d7032f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5fe185759c5c5.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/f133b735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_60337e8b861ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_5fd159d7ec17c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_603446112e1db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_9caf571f2af74d61a4b6c2b50057dcad.pdf?index=trueIn PDF document text
    • http://lejepaxe.rf.gd/barriers_to_curriculum_change.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_3fd8cfde1d584e0fa15594ff4e33be53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d94b204-774b-4550-9e66-ce0c9c0a9259/mexodifanedogibudesoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d2088f-ac93-40c2-a90f-5c0ecdd2c837/the_pedestrian_by_ray_bradbury_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7900da-1f57-40af-854a-61618a1c8795/87045228538.pdfIn PDF document text
    • http://lenakosubib.rf.gd/36908614369.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_8a3731e4e0e84beb8bc03eba07914f7e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 5332 bytes
SHA-256: 42d4d981d4955b7194058f1fda235ae7875a8a1706bb537f19919b3d0bfc916e
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 3152 bytes
SHA-256: 61ee1c17271f787c06c278c5bb206f63eadf3069265a3789f42cbb215e5cb849
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 11764 bytes
SHA-256: 9383567440adffefe933ad548235193b9c9976b600f8f39bc7dc60fe5118d636