Malicious PDF — malware analysis report

Static analysis result for SHA-256 845adaca604f188c…

MALICIOUS

PDF

83.4 KB Created: 2021-10-09 13:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 856184d5c530e6f77e684cd1cc1cb4b0 SHA-1: 698dddbccef1e4972c3c4bbcdef40822cddc1f5a SHA-256: 845adaca604f188c843703d25276ba2c9e6b7d818b6f7a3e2054d8730d204552
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of links pointing to distinct hosts, with a heuristic flagging it as a 'link farm on disposable hosting'. This suggests the document's primary purpose is to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://upasamed.org/Content/uploads/files/17834440135.pdf In PDF document text
    • http://jamuiboe.com/webroot/upload_media/xobuxovisa.pdfIn PDF document text
    • http://chikatere.com/Upload/files/64262025052.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/nilepaxoxun.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/21244838608.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/roninovufegerutonon.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/50036881019.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///xururegebakuraleki.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/pekajevuleku.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/26251485702.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/7976849814.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/edfc9866080aeeb89e2ded9f4003ff03/51786637808.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/lusebugezulomidekig.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/30209493121.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/69609606099.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/xejebatuxinilinelawap.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/juzumexotetamifufibo.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/20379119801.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/91011932180.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/kevovomu.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/58303708017.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/tadetudugujipopati.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/pigir.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/zoziseso.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/99456568505.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/59233654410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2nd+hand+house+boats+for+salePDF 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 10624 bytes
SHA-256: 41e74686fa297daa6d287480c3c3ca62cde63f775efc25d9d383947283bdaf72
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 18556 bytes
SHA-256: 962e5633bc5b45ebeb6b153f7470ef1b175f9f0aa2c8b9da9399ac3fe0987eba