Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eda78ade0e73114…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 19:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06fd7a88368baa15378bdf5795573300 SHA-1: c8d2d3892bd2f893d6fea3b3c21a31e133a89c00 SHA-256: 5eda78ade0e731142d40b90a83444bae5a4c6a6257036bc98fa40466e45e69dc
224 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, dafemum.ru, which is likely intended to lead the user to download malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://dafemum.ru/123?utm_term=antivirus+para+celular+apk+full In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_6052628f936a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_6042caefce2d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5fdd26064dda0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_601df816bc38a.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/samsung_remote_control_aa59_not_working.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/sukejizuruvaxumupa.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/vubipedovalosisal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479684/normal_5fcd7caf48cf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcf603f5e1fe.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/name_change_ontario_social_insurance_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_60154c67754b2.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/jarirotexab/jusibuvazal.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/vivubovamivobenotorave.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_1dd9befe39c64358b02a3dbef8e28511.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_b44086969f36471885ec07b97cd7fd6e.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_2045505813b04e019f4f1cfa6ca3e261.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/10613810891.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/32493281045.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_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 5120 bytes
SHA-256: d5a67cb69dd749972df83749b53484ca1a80b43f107fa2767a52d6abbfb0b7cd
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 12508 bytes
SHA-256: 40e8ca7114878484000654a5156deded04fecfb9de2906a542a7afac7a7818e3

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