Malicious PDF — malware analysis report

Static analysis result for SHA-256 950269559c5619e9…

MALICIOUS

PDF

94.1 KB Created: 2021-03-29 14:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f84c6ba77d4b3d9e05df7f0857ea1af6 SHA-1: c798254d0a4fd1bec2ea1a7f8fbc938d41c56862 SHA-256: 950269559c5619e9caa76458b5e34fd8f8487b9283626eb1d9a3ac3a6153b390
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic confirm the nature of the document as a deceptive link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/wix?keyword=namd+manual+2.11 PDF link annotation
    • https://cdn.sqhk.co/fakineduxafe/hhchdFG/84035471964.pdfIn PDF document text
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/wanokaxulunalojolaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_603bbeabead4e.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/d04191.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/hgjijhb/tuvevip.pdfIn PDF document text
    • https://vovamujif.weebly.com/uploads/1/3/5/3/135318660/4dc80cf76db1e8.pdfIn PDF document text
    • https://cdn.sqhk.co/pexufenek/e5e3jbi/17244291662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486037/normal_5fcb934057bd7.pdfIn PDF document text
    • https://gupekuvexo.weebly.com/uploads/1/3/4/6/134610658/056d97641e.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/2fe4913ce1.pdfIn PDF document text
    • http://zekofurul.iblogger.org/bankable_leadership.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/Ujizghw/67896454175.pdfIn PDF document text
    • https://tabajojimito.weebly.com/uploads/1/3/4/3/134317549/luripifuretiz_neguw_puronifejisob_wividitew.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/jakevepanirivojuzu.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/244979c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403680/normal_5fdcf88a86ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_60360960b1a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_604376a64e041.pdfIn PDF document text
    • https://vukumurumijolot.weebly.com/uploads/1/3/4/4/134433046/sumukujapike_xotadoxegipujuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_956e8450447545e7ab3e170863412f76.pdf?index=trueIn PDF document text
    • http://zugemanuzori.rf.gd/57801394163.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_9381508de8b748e4967b19c8483fd89d.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_2c9a6ec5cabd435a89207ffb0be814e2.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_d7c3e2640a4145dfab6bc5040c8b024b.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_3b3dafc161e24100b3b910fcdda9c976.pdf?index=trueIn PDF document text
    • http://mebexadesojixip.rf.gd/ravens_injury_report_2018.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_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 4880 bytes
SHA-256: b61d8410db38f212bd02866cd5565e143a2add0e92e75557587e9293c80065b6
font_01_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 11368 bytes
SHA-256: d85838696222bc5a4d778cf406d78f39c952822365a030fd930b83824223537d