Malicious PDF — malware analysis report

Static analysis result for SHA-256 1305936042f148e2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 10:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2efcb128c773456348e79d34ba16ca3 SHA-1: 7dec9dbd9e3a8ba77a1065df4dd2f4bfb2931ea4 SHA-256: 1305936042f148e2390bbb36b56682f2b4af5ccf1f9dfa86c19957bc304ead9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://allytemp.ru/uplcv?utm_term=map+navigation+apk PDF link annotation
    • https://nhahangbienhaitien.com/uploads/files/budupoduwogoseni.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/tenesudezom.pdfIn PDF document text
    • https://scalping.ir/data/files/file/roragevafotosevedosojuviz.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/vigalulomive.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/85360447503.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/jogutakesavesu.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/79237902055.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-13/images/files/77440954196.pdfIn PDF document text
    • http://kbchina.de/upload/43103315560.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/50295038133.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/potadudifimebetofowuvut.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///sopevesofumekilatunewoki.pdfIn PDF document text
    • http://kco.su/userfiles/file/14914779154.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/miveb.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/28620638312.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/35674101149.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/33315298756.pdfIn PDF document text
    • https://themalc.org/files/file/nagitiro.pdfIn PDF document text
    • http://salwex.hu/file/xizabonetodof.pdfIn PDF document text
    • http://indemo.pl/Image/files/fenewikowajapitel.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/71175796950.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/kafex.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/sejuloxiwowegulaxapata.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/67395642208.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/mifopitemivi.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/38518158896.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://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_off0000c39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39B 10132 bytes
SHA-256: a598a99a56aae8971c26da1b22e8864c679d9a25e99f41fa0c109c3a060053b4
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 16896 bytes
SHA-256: 530b667c02f811c4b9bb1a8afe1de8d02cc3c6f90edfb96d7176d31005e38985
font_02_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1