Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c446abea5fbacad…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 01:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a44637c4d69b78165b481d2bbd02b5af SHA-1: 6b98db1df14f564f1e7ed09e76f6e6de40322dc4 SHA-256: 3c446abea5fbacad95f0370a3603c68a2771598547125da47a5b24a0132c05d5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains used in link farms, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://xn----7sbjvweekof5d.xn--p1ai/files/files/ramoxa.pdf In PDF document text
    • https://petala.gr/userfiles/file/jafasiburemurejugo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/52772993596.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/38015063332.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/pulex.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/46661306417.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/fovopozobonumelobo.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/6326694237.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/83559516808.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tabodawowowafur.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/45850962195.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jojukekuxafegabuzenuwutox.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109130558242715.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/34522998275.pdfIn PDF document text
    • https://ebooksweb.net/files/file/44172452820.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/bekolatun.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/48970544200.pdfIn PDF document text
    • https://tebra.si/userfiles/file/karurubidoxuwo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbc796a2e---45135305934.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/jobunajumodi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/10166586709.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/mogixozobixepiduned.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/gofifexaxobaporo.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/46985689704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=aladdin+movie+tamil+dubbedPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD300 10428 bytes
SHA-256: 492914845097a0b949ea6c2999664b9204ea13783e3ba1d2025a6d9b2650a740
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 18120 bytes
SHA-256: 2a71194f19be84f8503532c4fe6e070cd8eedc4a8c3576a711b0d39b59bbeabb

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