Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c685dfeca8e6ab…

MALICIOUS

PDF

78.7 KB Created: 2021-02-15 03:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 56102c840bf86ec6aef4a6d09226159d SHA-1: 8bb4a476b5390f6ac4f0ba878a20e39c14df9048 SHA-256: b4c685dfeca8e6ab5916b82cf5f978ff5bbac26026bdab14ff132913eab79583
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://yafferge.ru/aws?utm_term=body+massage+consultation+form+template In PDF document text
    • https://xijapesulole.weebly.com/uploads/1/3/4/5/134588017/7362799.pdfIn PDF document text
    • http://logoped-samara.ru/27857133319nrjfg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6013aff6700d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_6006652f4d990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5fc5f0abd722f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fdf91ae5452e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff1572caf487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6016772a2c52a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_6006a70f22306.pdfIn PDF document text
    • http://axecheat5.xyz/naxuzuramafo70oxu.pdfIn PDF document text
    • https://punizino.weebly.com/uploads/1/3/4/3/134327780/d0a53f.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/6486911.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/vosimalume/kivowapezokusipa.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/tonudenesobunamoze.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/employee_luncheon_invitation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/js_convert_byte_array_to.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/buzikuraguzisewulaxosujej.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/vavulajufupimij.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/bootstrap_animation_website_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/android_autocompletetextview_text_change_listener.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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5624 bytes
SHA-256: 9a31385729c65babf9a27eaebc8eaf9ee6ee53e6a736ec6e9be45012a14e2faa
font_01_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 10544 bytes
SHA-256: 662cffb81d943d11dfb830628f53cfc91948921c225d530f1761cb3839b568fa

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