Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea53204d0643ee8…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 05:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e349a77dfa63b4ed0589189856f2036 SHA-1: b6ebcf5e29abd8ceacd1329065a62ce6215c98b9 SHA-256: 1ea53204d0643ee84e22c5b50941cb4958bcba98ea0429b919d2e4846da777af
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, and one primary redirector URL. This suggests a phishing or malware distribution attempt, masquerading as a character map to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=the+crucible+act+1+puritan+problems+character+map PDF link annotation
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/gorabijuvomova.pdfIn PDF document text
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/joluponerigutotemor.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/4564654.pdfIn PDF document text
    • https://xuvetopugoseja.weebly.com/uploads/1/3/4/4/134484667/4311985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_42a9e0e6e14e464a9c10e5f4ea98bb83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/chevaliers_de_sangreal_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/xezefolidalavirubunivuser.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/peradapodegemiwager.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_e47b75de3c434fb5b6b91a5523b6bb75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/manual_photography_cheat_sheet-_reloaded.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/vegokalowevavuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/wafolawobawa.pdfIn PDF document text
    • http://ripapekum.epizy.com/gegudatixikupalaroti.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/velufawabavorugow.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_21a040e3ca354cfdac60b378e853ca71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/xuxaxaguwaparopelu.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/47744625439.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/5823529363.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/90157542337.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_b18ffc12416b4924b825afa4800fafb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kevava/dibizat.pdfIn PDF document text
    • http://kuleborujakojij.rf.gd/star_chart_gift_set.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5316 bytes
SHA-256: 958378bab5766cd3ecce6b9cc12741f829ddf14e2182a2eaac8ee2a24df1e725
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 10192 bytes
SHA-256: af3af4b110803d32e20061716611ed2d5823045c673cd488557b6d8862060a1e

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