Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b71849141c30afd…

MALICIOUS

PDF

80.3 KB Created: 2021-01-05 22:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7fb2964a7f80bf389dc86eb3f2164c64 SHA-1: 2d96df07bb98c11c3e4764c84a40e84dedff4ec5 SHA-256: 1b71849141c30afd124f7c7295eccc5e1bc558f5b90c527dce2d527aae3998e0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, suggests a lure related to free antivirus software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload or redirect the user to a malicious site.

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://ggtraff.ru/aws?utm_term=gratis+antivirus+smadav+versi+terbaru In PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/kefigad.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/1079143.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/zerepigowuma.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/nivegamugawi.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/wovug.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/jejulurowev/49387946522.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/kuxizapimaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1529db13-1450-4939-8692-282028eef6ac/dj_marshmello_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/zidanasabusopoje.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/firewall_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd93347-485c-40bf-adc6-d6c9c68db3e9/pufuragaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/detidavutozaziwurafapawuw.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/40782620683.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/soxal.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_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 5168 bytes
SHA-256: 2bb01dbec278307d636cf93290d12b64a431df7bfb5d0682e34f01cb7464bdbc
font_01_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 11068 bytes
SHA-256: 2f09696c156cbacb13657b60081225411cf689a4589acccf767d69f8de1665ab

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